The answer is using a click macro, this way it is automatic. The comma's below represent the 8 sec cooldown. Just drop the macro below onto the tool bar and reference the slot it is in the bar in another macro whcih then can cast the slot instead of the spell.
Take a look here:http://www.dual-boxing.com/wiki/inde...ro:Using_Click
/castsequence reset=combat lava burst,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,