Buy a palmtop?
Seriously though I don't know what was done to CS to make it playable on PSP (that kinda stuff isn't really my thing... yet) but whatever it was would most likely have to be done again to each individual mod that you wanted to play on it. This is the reason that CS Wii isn't getting any mods as DLC, aside from the fact that they're, you know, not exactly professional or official or anything.
Wow typing is really hard :<