just curious, but if you’re going the whole polish notation route, why not allow for more than 2 operands. I feel that one of the huge advantages of this notation is that operands are not strictly binary. I understand that you’d probably need to use parenthesis if the commands worked in this manner, but It might be a helluva lot less confusing to look at the commands if you’re forced to use parenthesis for compound expressions.
for instance:
ADD A B C (ADD X Y Z)
These are just my two cents, even though I don’t own a modular system… yet…