"i think blender should have both - hotkeys and manipulators "
I totally agree.
I have used them in Max , Character Fx and Maya.
Many highend packages, if not all, have them...
Alias did not demanded discreet for copying it...so I doubt they will think they're gonna earn something demanding Blender
At the end, all are copying each other...and too me, that's great for the user
If you have both systems, you can use which ever you prefer. And even in some occasions, even being used to keys...it may become helpful.
Is something I wish Wings3d had also. Would cut modelling times even more
But a problem to see is if the software can afford that graphically, for performance.
Metasequoia has them, but I can just disable them if I want.
Hamapatch has exactly Maya ones (arrow tip ones for move, cube tips for scale, sphere tips for rotate) too.
I love best the ones of Max. I can configure the size of them, and mostly I have the added feature of dragging the plane I wish: the form a transparent plane with every two axes, so, you have the possibility of drag an axe, or a plane, to move in two axes at same time, or click and drag on the center tiny cube of manipulator to move freely in 3 axes.
and so on..I wouldnt get into discussion on why are them so good, but is a fact that many users come from that background. I mean, new users for Blender. Adding as a preferences option(even disabled by default, if you prefer) would be a nice detail for them. It would also give the possibility to people that think they're no good, to see ho much good they are. I know as I have used both.