Hmm, I don't remember how SWTOR was... but maybe I can make a packet version of this or something. Drop down menu, or list that you can select affection items you want to use. Then after that, set a timer for how long you want it to run, then hit execute. It will loop through all the affection items until the time is up, or until the items are gone.
But this is just an idea really, I never player SWTOR too much... so may need details and some help for item names and such.