Welcome to the site Zirconia

I hope Screenshot Captor suits your needs -- if not, hopefully the forum can still be useful to you -- we are a friendly bunch.
You've asked a few different questions, let's see how many we can answer.
The easy ones first: If you want Screenshot Captor to take a picture and just shove it in a folder without any further input, then you'll want to change the option for what Screenshot Captor does after a capture. It will always save it in a folder, but by default after a capture it pops up a window asking you what you want to do. I'm like you I don't need that pop-up post-capture dialog.
So the next time that post-capture popup comes up after a capture, look for the option on the very bottom that says "After next capture:" and choose "Stay Minimized in Tray". That will solve that. Then just open the Screenshot Captor window from the system tray when you want to view your captured screenshots.