AKAIO 1.6?/lemmings

Forgive me, bt my AceKard will be delivered tomorow (I hope) an I noticed the new firmware, 1.6 RC1.
What is RC Mode (that RC1 referes to)
is it best to use the 1.6RC1, 1.5.1, or the official 1.5 Firmware?Secondly, why has Lemmings not been created for the DS? it was a great game, that would work well with the touch screen!

Try this link if you like lemmings.
http://www.mrdictionary.net/lemmings/Some one has been working on this project for some time.

RC means release candidate, its essentially a version before final.

Will this work with the R4 Ultra?

Replying to #4

Nope.
Moderator Edit:
Removed unnecessary comment that would just cause fights.