Yeah sorry, there aren't any in game macros that will allow you to execute actions for 20 minutes straight.

There are legitimate ways to use in game macros to target enemies, turn your character etc while using a controller without the window even being active. For example, a BRD could use something simple like this:

/targetenemy
/facetarget
/action "Misery's End" <t>
/action "Bloodletter" <t>
/action "Heavy Shot" <t>
and they don't even need to have their monitor on to put arrows through everything around them. It requires continuous input however.