I've a feature request for you ... (really 2+1).
I couldn't help to notice that by activating the 'Manipulate Bone' (Z) function, the function bar at the top of the screen remains blank, unlike the 'Transform Bone' (T) function. Wouldn't it be helpful to have a box with the numeric value of the angle of the selected bone? This could enable the animator to copy and paste certain numeric values from bone position to bone position in a very precise way (within one bone over a time period but also from one bone to another bone)... and it would be a huge time saver too. Maybe have even a 'Copy Angle' button, which by pressing saves the value to the clipboard and a 'Insert Angle' button for pasting/applying the angle to the bone at this keyframe
The second feature I request is an option in the preferences to disable the 'Auto-Freeze Frames' function. It happened to me twice, that I accidentally enabled that function, which brought me a lot of trouble!
Ah ... and a last thing. Could you please bring back the 'Materials' tab for 3D objects?
Well - it's the advent time, and those items are on my wish list for Santa!
