When you say "switching to different crossbars", I hope you don't mean like cycling through them with r1. Because there's a better way.
Otherwise, it's not that big of a deal to switch from R2 to L2 or R2 to R2>L2.

Also since it keeps popping up, pressing a single button repeatedly is just as likely to cause carpal tunnel as pressing different buttons. It's the repetitive action that causes it, not moving around.