While the idea of breakable doors sounds awesome, the only thing I can think of is this being just another prop that can crash the server. What if the door gets stuck and then decides to start killing players? if we can test it and it functions right then im down for it.
It's decently old and I don't think he is necessarily proud of what's on his workshop but I know it works as intended and hasn't crashed any servers that he's hosted with this addon, if that's worth anything. Only thing I'd be concerned about is what j3k said above. Otherwise +1, it would be nice to have SOMETHING to combat doorspamming
Rejecting for two reasons:
1. Knowing how fragile the Garry's Mod engine is, I really highly doubt this plugin doesn't cause crashes.
2. It'd be a pretty big gameplay change that would require much more community support to justify implementing.