Well, i'll start making the ideas and help.
first of all, osu!taiko and osu!mania targets are static. You press the keys once the dons/notes reach the drum/bottom row. That doesn't move in osu!taiko or osu!mania. osu!standard has circles, sliders, and spinners. that's it.
So he could have the notes/holders/spinners come from different directions and the targets can move during the song. Do you get this?
EDIT: also, on osu!diva, the targets change, moving across the screen. in this gamemode there is one location that moves per button.
and yes the keybinds can be osu!mania style.
EDIT 2: If you really doubt it, I'll make you see the good side. Don't hate on _Mee, P_lease.