I've been playing around with the macro system and trying it similar how I use to use another VTT.
when I use a macro such a /roll 1d20+
it would work find with a macro titled #d20, and I could add a modifier when using it from the chat window. However putting such a macro in the macro bar results in a syntax error because it is not receiving any input.
I'd suggest maybe adding a simple popup window of some type so that if somebody executes such a macro from the bar, they can add the modifier and continue. This might it simple for a GM to add a macro like:
/roll 1d20+ Perception Check
Then when a player clicked it, they would just type their modifier.
Just a thought!