Ideas:

-Grappling hook: Not a futuristic "batman like" grapplehook, the tool is just a throwable that sticks to specific ledges, like windowsills and balconies, and should be like the binoculars, only a certain number per map, and only a few intruders get it;

-Nightvision: Like the grapplehook, only a few per map, and should be usable with the sniper. I was thinking that maybe the binoculares could have and integrated nightvision (the usage of the binoculars makes the user unable to shoot, that might balance things out);

-Flashlight: Like the red dot, it should be a weapon attachment.

There's many reticles in the game as of now, we all use the x dot on our smg to get more precise shoots on the distance or to stop looking at the iron sights(you can get use to it but you can't deny it's blocky), so why not implement a new setting that will allow players to change their reticle color and opacity in order to have a more suitable sight for each and everyone of us.

Image of Rainbow Six siege's reticle color customisation to take as an example/idea

Hey here a quick idea, It would be cool and really fun to grab an enemy as a human shield! BUT you need to knock him down and arrest him first, then you can grab him. Real player hostages could be a plus for the gameplay we have in Intruder.

A feature where you can click the info button on a players profile and there is a spot to leave notes. Maybe how they play or why you downvoted them. Personal notes that only you can see.

Add a new SMG under the guidelines of it having less damage, maybe lower mag capacity, lower fire rate, but more accurate and with better iron sights. The best fitting weapon I found that would fit the style of the game is the MP5. In turn to make this SMG more desirable make the current SMG have more recoil.

I don't believe it is current possible to change what equipment each team has access to by default 

Change the default slot to slot 0 or slot extra. By default, the Bloon Cam takes up slot 2. This means if you pick up a sniper, shotgun, or riot shield, you will have to manually change both the slot number of the special weapon, and the slot number of the Bloon Cam, which can quite often get you killed.

Some nice UI to bind hats on buttons, so you can turn them on/off by tapping 1 button. Or just simple command line binds (ex. "/bind j say "/alert 1"")

there should be added NVGs for intruders and flashlights for the guards, and maybe flares aswell, so if an intruder is using NVGs, a guard can throw a flare infront of him and completely blind him until he takes off his NVGs or the flare dies out.

Add additional setting in "Create room" window: 1. Autobalance teams after practice round 2. Autobalance teams after every round 3. Off

Add a flashlight to the game so we can see better on night maps

Make weapon skin icons at an angle, so we can see whole weapon. Plus you can see a bit more of the skin! (if your seeing this on discord click the link to see the images).

Allow the ability to pick up cardboard decoys. (because sometimes they are not placed right or want to be reajusted)

Also, give the decoy physics (fall over) only when shot. (not player colloison)

(It would react in a way that is more realistic, and simulate balance.) (the way it reacts to being shot depends on where it is shot) (For ex: It will fall more dramtically when shot higher up or shot in the back, opposed to being shot in the front near its supports)

it would be cool to have bodyarmor you can pick up.

it would be cool if there was a way to take the radio of the body of an enemy to listen to their radio channels, or some other way to listen to enemy radio channels.

Add a command (/help or /commands or something) that shows all available commands when entered, and what these commands do. Would be quite a nice quality of life addition so admins of servers don't have to tab out to the Wiki to check what a command does or the name of a command.

Currently, you can only access the Item Cache in the main menu. This means if you want to change cosmetics or want to switch to a new cosmetic you got after levelling up, you need to leave the server and possibly lose your spot in it if it's almost full. Adding the ability to access your item cache in a server simply through pressing the in game menu button would be really useful.

I find using all the number buttons a little confusing, its often that I pick the wrong item because of it too and have to fumble around. Maybe adding an item wheel could fix this problem if enough players have a similar issue?

Press X to remove suppressor from panther pistol. Use? Maybe better accuracy, stability, or damage.

Add pistol red dot sights. The ironsights for pistols, while not nearly as bad as the Kobra's ironsights, leave a bit to be desired for. Additionally, they could be useful for longer range engagements on account of being able to "zoom in" with the SMG red dot. Functionally, they would be identical to the SMG red dot, spawning around the map and being equippable onto a pistol, but would have a different model and different sight types that can randomly drop when you level up, just like the SMG red dots.

For reference on what the sight model could look