seriously. start making your own maps and see if you can implement physics like inflation into the map code. good luck there. Please get familiar with how things work on q3 engines before making rather silly suggestions even tho they themselves might seem ueber realistic and such.
btw: similar to doors, breaking things is just another cheap ass *hack* of the engine wich is in no way anything near the complexity of inflating tires. Remember maps are indeed completely static. All things like moving platforms and doors are in truth poorly implemented engine hacks that dont work properly and dont add up with realistic physics. In fact I dont know any engine that does any network compatible physics right now. If you read my above post carefully you should already know that. Finally even if it would be possible to implement such a feature it would surely not be worth the asymetric effort for the cheap effect of having flat tires. With games like GRAW coming up I'm sure not even that engine is capable of anything like this. At least not with network/multiplayer code running at the same time