Click in tab area to active pane?

Hi, first, Directory Opus is the most well designed and useful piece of software I've ever owned. Thank you!

I often find myself clicking in the blank area to the right of a tab to switch the active panes. But it doesn't work - I have to click on a tab, or in the title bar, or in the lister in the pane. It's a small difference, but it seems intuitive that clicking in the tab area would also make the pane active. Is there a way to set this, or could it be considered as a change in a future release?

Again, thanks for such a fabulous tool.