Support for differentiating the tweak tool from the 3D cursor when select is set to RMB. This is currently an experimental preference: Tweak Tool: Left Mouse Select & Drag When enabled the tweak tool can now tweak the existing selection without de-selecting first, a single click can be used to replace the selection. This matches selection in the graph & node editors. This preferences is only available with "Developer Extras" enabled. Ref T96544.