Recently became interested in the product.
Working with a mouse is extremely unusual.
Have you considered making changes to SweetHome3D?

I made the changes that made sense to me.
github.com/keich/SweetHome3D

1) Zoom without Shift
2) SelectionState with PanningState logic.
3) Demensions lines in SelectionState
4) SelectionMoveState with block small movements less 100ms