If you rename a file, it won't recognise it in someone else's server, so you're gonna have to redownload each time you join, or just have the default models.
If you want to organise stuff, use the category maker in RTB and make different categories
Bushido has a point there...
Sometimes I wish that there was some sort of add-on favorites, if you know what I mean. Like there are brick favorites and minigame favorites... Or has that been made?
So yes, it's already been made. RTB3.2 or something gave the ability to create groups of addons in the addons list so you could find and tick them easily. For example, i have the group "favourites"