I have some improvement suggestions for 3D mouse support in Draftsight:

Provide an option to set the 3D mouse zoom to zoom to the mouse cursor.  It currently zooms to the center of the screen.

Separate the mouse axis's.  I have preferences as to how I like my 3D mouse to pan, zoom and such.  Draftsight limits me to a few setups.

Alternatively, have Draftsight use the inputs from the mouse software.  As it stands right now, Draftsight seems to interface directly with the mouse, meaning I only have Draftsight's options.  My mouse maker has software that allows me to fully customize the use of my mouse, but Draftsight overrides these settings.