I have a few in-game macros with "/mentorlevel <N>", so I just hit a button to set it for everyone, e.g. "/mentorlevel 60". But I often just turn on broadcast and simply type the word manually. I think it's faster to just type it out than to set up anything more special.

Luxlunae, for equipment I use the in-game /saveequip <N> and loadequip <N>. While leveling up and equipping a new item on all characters, I turn on broadcast and type "/equip <item-name>". Or "/use <item-name>" to have everyone collect something (like a book or something).