Ok so here's what I did and perhaps it will help answer some questions. I left the evaluations sections completely blank when I submitted my application (submitted June 1st, verified June 9th). As it appears you already know, you cannot edit or delete requests once you submit. If you are unsure as to exactly which letters you are sending because you haven't received them all in interfolio yet, leave the evaluations section blank until you compile all your letters. Regarding whether or not you should click "I am not adding evaluators", I'm pretty sure you can't submit the application unless you check that box (assuming you've left that section blank). If you can submit the application without clicking that box AND without adding any evaluation requests, then I'm not 100% sure, and you should call AACOMAS to just be safe (I'm pretty sure you can't). I just recently received all my letters to Interfolio June 16th. Later that day, I successfully added the requests to AACOMAS, and sent them to AACOMAS via Interfolio yesterday. (they arrived today, 1 day after the delivery was requested). Good luck!