Is there a way to auto mine a perimeter without schematics and maybe have selections like world edit.
-Having an option to select 2 coordinates and mine the area or do other things with the selection like maybe exclude some blocks.
-i wonder if it is a question or a suggestion...and i am really sorry if it was already documented...or if there is a way to do it. (if there is a way to do it, it would be very helpful if someone shared it.)

to exclude some blocks you may want to look into using #sel replace instead of ca

yes,
you can make a selection by either drag-clicking with #click or #sel pos1 / #sel pos2 and then you can use #sel ca to clear it

Thank you so much and sorry taking your time.