Since DSLua uses PALib, you should really make some great and easy functions of PALib available to DSLua scripters... some great ones to start with would be:

PA_InitKeyboard
PA_KeyboardOut
PA_CheckKeyboard
PA_CheckLetter()
PA_LoadGif

This would give DSLua users instant access to a sweet onscreen keyboard, handwriting recognition and the ability to quickly and easly load GIF background images onto either screen (0 or 1).

If you really want to make DSLua great, add regexp and some good string functions

Yes, DSLua has the string, math, i/o, and table libraries found here: http://www.lua.org/pil (Part III)

I think we were planning to add a keyboard, it'll probably be in the next release.

Why not use PAlib's keyboard, already coded for us?

No, it doesn't work like that. You can use PA_CheckLetter() at any time to get the letter that is being pressed on the keyboard.

Seems to me that, if it's possible, it would be beneficial to have a way to execute arbitrary PALib code from within DSLua. This would solve many problems I see people complaining about, if only they were interested in learning a temporary method (to be replaced by future DSLua code). What I mean is that people could extend DSLua themselves by using PALib C code hooks until it is implemented in DSLua.

This would be similar to the way C/C++ coders use assembly code to get deeper in the system.

EDIT: Ignore all of that above, it was me trying to think outside the box when I had no idea where or what the box was. I didn't know enough about the Lua C API at the time.