Tony Hawk Pro Skater 3

I downloaded THPS3 again, to find out my wireless KB is giving me shit.
Every time I get a more advance keyboard, it seems to work like crap in THPS, e.g not being able to press a few keys at the same time..
I can't hold a combo for more than 15 seconds because of it.
Does any of you use a wireless kb+mouse and still play THPS3?

It has nothing to do with wireless. I've played for over 10 years with a wireless keyboard with no problems at all. Last year I bought a new wired keyboard and I got the same problems. It's called ghosting. The keyboard should support 5+ simultanious keystrokes. My new one does, but apparently it only works for the common game buttons like wasd etc. I therefore have to connect my old keyboard every time I want to play THPS3.

That's interesting, every keyboard I've ever bought worked fine with multiple keys for THPS. You might want to take a look at SteelSeries 6Gv2 and 7G keyboards, they got full anti-ghosting. Usually the old keyboards use PS/2 connector ports which support more simultaneous key presses whereas the newer keyboards are all USB.