while most of my hotbars are fairly empty and I find Shb is plagued with not enough buttons and missing gaps in the jobs here's some ideas I've got for buttons to merge

Monk: stances consolidated into one button that cycles
Pld: upgrade intervention into cover, shield bash is now pld's stun instead of low blow
Drg: stardiver is now an upgrade to dragonfire dive
Whm: cure 1 upgrades to cure 2, freecure onto stone, medica upgrades to medica 2
Ast: Play is recombined with draw (its pure bloat, 30 seconds is more than enough to do what you need to do with a card) and benefic to benefic 2. Enhanced benefic moved to malefic or draw
stances now one button that cycles. Delete undraw (I have never seen anybody ever use it or its companion undraw spread)
Dnc: Fan dance 1 and 2 combined