dear @Rhino_Bulgaria
why are you unhappy with the macro-solution ?
an alternative macro would be
_mirror _pause _3Point w0 wr0,1,0 wr0,0,1
and of course you can do an alias to this macro “mwy” “mwx” “mwz”
I think the amount of commands and options in rhino should be carefully expanded. I would appreciate some concepts to reduce the amount - not to increase. And i think as an advanced user macros are great to implement personal workflows.
So i would argue: something that can be done by a macro, (or a simple workflow) should not lead to a more complex command / options - structure.
This is why not support your initial idea - sorry:
My beginner-students already suffer with the existing commands and options:
anyhow, your topic reminds my to an older idea i forgot to share / wish … i will post an extra topic: tnamend transformations as this might also solve your / this wish.
kind regards -tom