Basically what’s in the title - a request to enable sub-object selection from a mouse button.
This is one of the few often used maneuvers that I haven’t been able to consolidate to a programmable mouse button. (tried programming “ctrl-shift” to a macro but the mouse driver doesn’t allow this combo)
Rhino 9 Beta has an option for activating an automatic sub-object selection accessible from one of the buttons at the bottom selection toolbar.
Not sure if this button could be switched by a macro or a mouse button, though.
Interesting, hmm… looking for that in the Beta, I wasn’t finding it - except for a mention in the new Selection Filters? (oops, now Beta is crashing on update attempts so I’ll have to look at it again later)