Scratch must have masks !
What do masks ? (if smb dont know thats it)
It's define collisions .
Otherwise , on block

<touching [ v] ?>

<touching color [#554940] ?>

game define collision of mask with mask , but not costume with costume .
And masks must be for each sprite .
Oh , one thing . Make the flag “mask is same as costume” .

I hope Scratch Team will make it …

when green flag clicked
forever
switch costume to [hitbox v]
all collision code
switch costume to [visual costume v]
end

I might not get the whole thing, but I think this would work for what you are asking for, yet I support, because I might be not understanding the entire thing xD and that this may be very good. Though it may be hard for new scratchers to understand, and may break some old projects.

Sorry , StrangeMagic32 , but this code can allow some bugs …
And yes , you understand this thing .