Kitten please don't feel that you are being a pain! Because you are not. Ferals are the most misunderstood cats and their ways are not easy to adjust to. You are to be commended that you are feeding this colony and watching it so closely, but the most important part of being a caretaker for a colony is to spay and neuter. I don't know how many cats are in this colony, but in my area, three times a month a mobile spay and neuter truck arrives in various locations and spays and neuters ferals for a donation. Often times, I have gotten my rescues done by volunteering to be a part of a very busy weekend of spaying and neutering. It is an eye opening experience because the dedicated workers only do ferals, not house cats, or even socialized outside cats.
If you can locate a cat rescue near you, perhaps you can come to some sort of arrangement with them to get these cats done without it being prohibitively expensive on you?
Here's a link that might help you- also StrayPetAdvocacy is a good one- operated by several members here (who incidently, when they arrived here? They didn't know to much about ferals either!) http://www.meowhoo.com/Cat_Health/Sp...ces/index.html