yes... but i think him want add wiimote solo or with nunchack for "emulate" the gc controlller
Not enough buttons. Maybe you could play Path of Radiance or Pokémon with that setup, but nothing action-oriented (the things with which you need more controllers anyhow)
Wiimotes are, as was stated, supported as an "options menu" of sorts, switching certain features on-the-fly. You can play with a Classic Controller hooked to the Wiimote, however.
Devolution is obsolete now. Use Nintendont.
Nintendont is clunky as hell. The only things it has over Devo is the ability to play compressed and patched isos, really early alpha Triforce support, video mode patching, and cheats. (With the sole exception of Devo's hardcoded support for the F-Zero AX in GX cheat) Really the only reason to use it otherwise is if you somehow can't get Devo's verification to work. (Super Monkey Ball, I'm looking at you and my eternal frustrations in trying to capture the debug logs, when I can effortlessly capture screenshots)
Nintendont is honestly very clunky compared to Devolution. Both the fact that Nintendont's memory card emulation is incredibly hackish, causing slowdown with read/write access to larger "cards", and disc swapping to outright fail with 16MB cards, and the facts that you can't use USB/Bluetooth controllers and GBAs at the same time, and that physical memory cards must be formatted in GCMM to be guaranteed to work, especially if official, means that Devo will win every time in a feature contest.
It's probably more due to the fact that Devolution only supports the modem adapter, not the broadband adapter. Maybe if you very kindly ask tueidj on GC-Forever about such a thing, you may get more info on the feasability and/or status of such functionality?
LAN play on Mario Kart: Double Dash doesn't work as of right now, either. I wonder if there'd be any bandwidth complications on wireless connections? Or the need for a go-between application, due to how the emulation works?