I always use the turntable method of viewing in blender and it's by far my favorite as my view doesn't get all wonky while I'm spinning around.
but I like the ability to rotate freely as much as I choose so I'm not restricted to a 180 rotation, If I make something, and I want to rotate so that everything is upside down, i should be able to.
This is my biggest issue.
As for the slider scales, I wish they were a bit more user friendly as well, for example if i wanted to rotate... vertically 180 degrees around the center point, and horizontally 720 degrees ( just tossing numbers out there that will probably come in to play as animation becomes available in octane ).
I would also like to be able to change the rotation control point from center point, to the camera itself, and be able to switch between the two freely. This would let me rotate the camera around focusing on a control point and/or rotate it around from wherever the camera is, simply looking up and down and left and right ( like a first person shooter view sort of thing ).
Dave
I BEG YOU, if you change it, don't get rid of a turn table type of movement, just change that turn table to not be restricted with it's rotation, and add on other forms as well

CPU - i7-950 3.06 Ghz, 24GB Ram, Win7 x64, 2 display monitors, GeForce GTX 580 3GB Classified. I'm glad to say I LOVE OCTANE!