The recovery key change is still under study.. we won't probably implement it, as it's better to remember R = Recovery
Things like disabling the gameboot via the recovery, kernel autodetection, usb/nethostfs access, custom IPL use, tv/out, power vsh options, and other stuff that we have read might be studied.
VSH stuff like adding subfolders and submenus in XMB it's a bit messy, so probably it will be studied in the future.
About the basic/advanced recovery menu request, we won't probably make it, as the main advanced stuff is under "advanced" submenu.
@Be3f: We are awared about that, and we follow the investigations on that stuff. The best way to use right now 1.50 homebrew in slim is with noobz eloader1.0 (that modifies some 3.xx structure), as you might know.
Anyway, it's not too hard to modify the code to 3.xx kernel :P