Pin it to an MOSR (like Dragon said), but make it so that control of the actor switches over to the MOSR, so that it would be able to move the actor around. Granted, that removes leg animations and whatnot, but someone might be able to fix it as well.

Can't you walk on doors? I know people have made elevators and stuff with that idea.

So, maybe involve unpinned doors somehow, to be used as platforms that can be walked upon.

Unreliably. If they move at all, and sometimes if they don't, the same MO/MO things happen. Glitching through, splatters, etc. (experience from Castle Creations drawbridges)

yeah theres ways to jetpack glitch through doors.

Would it be possible to have it create mopixels underneath the actor's feet each update and give velocity to the actor according to where he is in the move-y thing?

edit: like that thing grif/p3lb0x/whoever made with the bunker pieces.