I look forward to trying ReiNAND on my New 3DSX XL, I'll get to it as soon as it gets to me in a few hours. It seems to have just about the right set of functions I'd ever need, considering I don't need to run out of region titles right now.
You know, now that you mention it auto-setting CPU mode would actually be very sweet. Even more if it remembered per-game settings. Although going by what I can infer of Rei's development style it might be a tad too out of the main scope to be added haha. What I miss from the PSP days are those XMB plugins, it was all so flexible. The closest we can get are things like NTR plugins I guess, probably because the PSP plusing system was used natively IIRC.