I personally find myself rotating objects by 45 or 90 degrees very often. Usig the rotation dialog and moving the handles/typing in numbers is rather cumbersome when there are many objects.
Therefore I would love a way to quickly rotate things on the build plate, either via right-click or as a small icon/dropdown/whatever somewhere near/in the rotate interface. And/or possibly integrate a keyboard shortcut to rotate object by 90 degrees (maybe 45 when holding a modificator key like shift). This would actually save really a lot of time, every rotation takes at least a few seconds to do and it does add up quickly.
You can use PGUP or PGDOWN
OH lol. Thank you so much.
Ok @Bambu please just document stuff like this properly, this one is missing as far as I can see 
Bambu Studio Keyboard Shortcuts and 3D Scene Operations | Bambu Lab Wiki.
Awesome!
You have this built in already. When dragging, move your mouse over one of the existing 45 or 90 increment markers, and it will snap to those lines.