[giaur]

I don't really understand your point of view.

I also don't want to split the 3D settings and move parts to several places

I think better solution is group all 3D stuff on one page.

If this is not global setting, it should be available during playback only. So the only correct place is video settings window - as I proposed already. In global settings - only switch to enable/disable all 3D stuff and possibly option like "preffered 3d mode". As a matter of facts, this is entirely movie specific options (almost all of them).

There is none to think about imho. For example, you don't want to setup subtitle offeset in global xbmc preferences, so why do you want to setup 3D subtitle depth there? Movie 3D type - the same. This is typical only movie specific.