Just off the top of my head, here are some things I would like to see.

Dreadwyrm Trance, Deathflare, Summon Bahamut, and Enkindle Bahamut should be 1 button. (I already do this with a macro.)

/merror off
/macroicon "Dreadwyrm Trance"
/ac "Enkindle Bahamut"
/ac "Summon Bahamut"
/ac "Dreadwyrm Trance"
/ac "Deathflare"

Energy Drain and Energy Siphon become 1 button. Deals 100 Pot to the first enemy and 60% less to all remaining enemies.

Egi Assault 1 and 2 into 1 button. Egi Assult has 2 charges. Casting Egi Assult grants Egi Assault II Ready for 15 seconds. and becomes Egi Assault II. Egi Assault II does not cost a charge to cast.