The post above sounds like it could be fun on some maps which where specifically designed for it, but not overall. Instead of changing the entire game for one mechanic, allow for easier implementation of it into user maps.
Maps like Mountainside which where made years ago would still remain relevant as new mechanics wouldn't render it unplayable or less fun.
In a perfect world, anyone can make their own goober grenade hell.
I am not a mapmaker so excuse my ignorance if this is not possible.