I hope for some skill replacement enhancements like warrior has where one skill replaces another dependant on stance.

Examples...
Dreadwyrm trance becomes deathflare.
Leylines becomes between the lines.
Enochian becomes blizzard 4/fire 4 dependant on buff.
Impact replaces jolt 2.
Etc...

Things that cannot exist in a state where there is a choice, saving hotbar space.