Just tinkering around with putting together a one-shot convention style game together and realizing that getting the brand new players in and having to explain to them the dice macros that they'll need to set up for this particular game and system is going to be a bit of a pain.
Suggested behavior: Macros defined by the game master have an additional check box to allow them to be defined at campaign-wide macros and propagating them out to all players, new and current.
This addresses the problem of giving new players in a game the task of setting up necessary universal macros, which may be problematic depending on the player's understanding of the dice roller syntax. And really, it's just tedious busy work that the GM ought to be able to save their players from.