Hello,
in Blender there is this useful Shift-shortcut: When moving an object and holding Shift, it moves in much smaller steps. This is very useful to fine-tune positions of meshes. This also works for scaling and rotating or tuning numeric parameters in a text box.
In UE e.g. it could be very useful for placing actors in the level or tuning the parameters in a material instance.
Thank you,
Thilo