1. You can share an entree for breakfast but for me I wouldn't say it would be enough for 2, my mom had gastric bypass surgery and even she was able to finish her meal there which is rare (we almost always share) even with the pastry trays (for a party of 10 they will bring several to the table) if you are a breakfast eater at all I would think you would want your own entree.
2. If you want lunch I don't think it is impossible, the nice thing about breakfast and lunch being QS is that you can make 5 parties of 2, 2 parties of 5, 3 parties of 2 and a party of 4, etc. If they are all within 15-30 minutes of each other they will more than likely work with you so you can all eat together (they have always done so for us when we asked) Maybe try modifying your search and see if you can get lunch if you break it down another way if you can get the time frame you would prefer.