[>BKA< T Wrecks]

Yes, the idea is nice. Me & my friends also talked about that, but that was at a time when none of us even dreamt of being in a position to post suggestions and actively contribute to the development of a bot... 9_9

If it were somehow possible to add this feature without introducing new waypoint flags, that would be just great...

Concerning that func_illusionary thing: I'm not a mapper, but if you say the curtains in cs_747 are func_illusionaries and SoUlFatHer says that many railings are func_illusionaries, then we have some f_i's that block your passage and some that don't. Besides, some don't block your passage, only your view (cs_747), whereas with railings it's the other way round - they block your passage, but you can see through them... o_O
I have no idea how bots could be told which one is actually transparent and which isn't.