In almost all cases if you can list for the jumpseat ahead of time, gate agents prefer that. At the very least its brownie points with the agent and at worst it saves you that awkward silence when the agent turns his/her nose up and says "I'm too busy to list you". I've never EVER had a situation where the agent didn't appreciate that I had already made a listing and had far more situations where I'm scrambling to get home on plan B or C and get the uncooperative/overworked agent.