Yeah, but there might be a deadline that fleaflicker cuts off and doesn't let you keep them anymore and they go back in the draft pool so be careful about waiting. I'd set keepers now and then go back later and change them if you want to think about it some more.
Plus it's nice for us to know who you're going to keep ahead of time to plan our draft. Not that I ever actually plan a draft, but you know, if I did.