Are you referring to bindkeys (middle mouse) to pan the view?
Options->BindKeys. That said, you'd probably have to write a function to respond properly to clicking and dragging with the middle mouse key. In IC61X you can use shift or ctrl with the mouse wheel to pan left or right or up or down in response to the mouse wheel movements...
How about this:
hiSetBindKey("Schematics" "<DrawThru2>" "let((WIN mySnap) WIN=hiGetCurrentWindow() mySnap=WIN~>segSnapMode WIN~>segSnapMode=\"anyAngle\" hiVectorPan() WIN~>segSnapMode=mySnap)")
It makes sure your segSnapMode is anyAngle and then uses hiVectorPan().