I'm not sure what PSPLua is like so I can't compare for you right now...

DSLua includes almost all of the same functions as normal lua, almost everything tought in this page ( http://www.lua.org/pil ) will work in DSLua. Of course there are also extra functions for the DS which are found on the documentation (see the menu to the left.)

So yes there is a dofile function, I would write it like this but your way might work (I've always used parentheses):

dofile( "mainmenu.lua" )

Random numbers are also the same as normal lua ( http://www.lua.org/pil/18.html ). Except for the seed number use DSLua.VBlankCount() which is the number of V-blanks since the program started (it counts up every 1/60 of a second.) So:

math.randomseed( DSLua.VBlankCount() )
print( math.random( 4 ) )

This prints a number either 1 2 3 or 4 (you have to set up the screens first in DSLua though). If you want it to be inbetween 5 and 10 (for example) you would put this: math.random( 5, 10 ) .

And no they weren't stupid questions, they were good questions.

Nice idea, should be do-able I guess.

Edit; As a matter of fact, I think I can help you with that, as in; got some code laying around somewhere on my harddrive. A "credits", "splash" or just "endscreen" query should do the job.

Yeah I used that in my Skip-Bo game for the menus. I made a tiled map of the three screens and scrolled them up when choosing menus. You can see it in the Projects forum.

Is saving present in DSLua 0.5?