what I often use is double view with to view panes and what I would like to set is two drive button toolbars. One for each of the views. I would like when press to first one to get focus on first view panel automatically and select desired drive and when press second to happen same with second view pane. What is happening now is that drive is changing in view which is active.
Just add OPENINLEFT or OPENINRIGHT to the drivebuttons commands.
See the video on toolbar editing, in the tutorials section, if you're new to it. It shows some examples using the drivebuttons command, as luck would have it.