In the Infinity Engine games, RMB served as a "cancel + move" action when you left clicked the ground with a character selected and RMB hold and drag rotated the formation of the party.

 

In Pillars of Eternity, when you bind action cancel to RMB, Formation rotate does not work anymore, but issuing a move command does.

 

Suggestion:

 

Make the default move action assigned to RMB have a cancel before the move command is issued in the method that governs it in the source code, or make it so that formation rotate still works when you RMB hold and drag even when you have action cancel bound to RMB as a secondary function.

Whoops this was meant to be a bug, can a mod please move it to the bug forum.