When you using the regular move/scale/rotate tool, the sensitivity mostly depends on the distance between the user camera and the selection.
For very precise control, you should use the Transform CV tool. When inside the tool, hold down the spacebar to show the hotbox menu. You can change the value of the sensitivity while holding down the spacebar. Higher values mean your selection will transform more "slowly". Transform CV tool also offers great ways to move things: XYZ, slide, NUV. Worth spending the time to get familiar with the tool!
Go to this page on the documentation: https://knowledge.autodesk.com/support/alias-products/learn-explore/caas/CloudHelp/cloudhelp/2015/EN...