Yeah just enter the ones you scout. No way you'll have enough points to do every prospect in a draft class, so it's a waste of energy putting them in. I find I can do every prospect from rounds 1-7 and a few UDFA prospects in a weak-average class. In a strong class, there's usually a position or two with some undrafted prospects projected in rounds 1-7. Most rows you'll ever need unless you're reloading etc. to refresh your scouting point allocation for a week is about 200.