Expand "Set SIDE=..." command to include buttons not in the Location Bar

Directory Opus 13 - Detailed release notes

Miscellaneous Commands

Set SIDE=... – Can be used in conditionals to test if a button is on a Location Bar toolbar tied to the left (top) or right (bottom) side.

Could this option be expanded to include buttons not in the Location Bar in order to determine which file display is active?

In normal toolbars, you can do that like this:

@if:Set FOCUS=Left
Help ABOUT // Example command run if the left has focus
@if:else
Help CHECKUPDATE // Run if the right has focus