Yes it's allowed as it's a 1:1 button press. Same as remapping your right click to be the letter A.
1:1 was never a thing.
This thread was added on January 26, 2017, with posts from JagexTyran.
Makes me wonder why it was ever allowed in Oldschool.
It wasn't, we were more lenient.
As in never a problem or never happened?
The whole 1:1 'rule' was never a rule, and was always a misconception.