Modifier Key Momentary Custom Selection: Is It Possible?

Here’s what I’m trying to do:

As in when holding down the “option” key when using the select tool, and having it switch for that duration to the split tool, and then returning to select upon release of “option”…

… I’d like to, through use of a modifier, temporarily engage the scrub tool when in select.

I haven’t seen anything that helps in that regard in the tool modifier preferences options.

Can this be done, by hook or crook? And, if not, can you do it in 5.x?



Has nobody tried to do this? I’m starting to wish I was on 5.5, if only to put in a feature request!

Still curious…