Yes like the guy that posted the combo maker with the spells have the cast time the same.. but if it mess's up around 12 or so this is why because when the mana run out the potion uses time and that interrupts the combo so try this.
KeyPress 49,1; key 1
Delay 1034
KeyPress 50,1; key 2
Delay 1034
KeyPress 51,1; key 3
KeyPress 187,1 ; = for mana potions
Delay 985
i got 56 combos with this with 3 skills
Search the forums for the guide on quick macro editor. i cant find it and i gotta go.