• Accurately emulating the game itself is more important than accurately emulating the graphics.
• Skipping every 30th frame would be virtually unnoticeable, except maybe if you pay very close attention to graphical effects in which the game is trying to murder people with a history of seizures.
• If you were to implement a variable game speed limit (e.g. 50%, 200%, unlimited), you would need such a frameskipping method anyways.

Yeah, pretty much every good emulator out there have configurable frameskipping.

Game Boy games usually range from 32KB to 1MB, while Game Boy Color games are usually in the 1MB to 4MB range (with some exceptions, of course). The Nspire CX has 100MB of storage space, so you'll be able to fit quite a lot of ROMs on it.

I have no objection to the GBCnspire speed management as it currently is. If you need all sorts of fanciful frameskipping and slowdown features, a PC would be a much better option. Also, I feel a slight slowdown is favorable on the nspire, due to its blurry screen. My only complaints are due to the nspire hardware, aside from the extremely minimalistic GUI and not having buttons vs touchpad as an internal option, rather than a recompile.