Rotating by 90°
Vertical and Horizontal mirroring works perfect, yet sometimes, It's just really annoying having to re-do certain parts purely because I can't rotate already existing ones by 90°- with this, I mean, for example a half ring.
Also, just rotating it and very carefully getting it as close to 90° doesn't work- the coordinates always seem to be very weirdly locked, probably because it's not really 90°, but 90.07 or something...
Hello! We recently added a Keyboard Shortcut to the Rotate tool. If you hold Shift while rotating, it will snap to whole degree increments (no decimals).
So, not exactly what you are asking for, but it should be *much* easier to hit 90 degrees exactly.