Thank you, housetier and 40hz,
I tried screenshot captor first (unaware of the delay option as a workaround) but then went "googling" to find a capture program that touted dropdown capture. I found one, but did not like that it forced me to take additional steps to complete a sequence of images (walking through an app to document how a process works). Plus, Vista occasionally complained about it "has stopped working." But then, Vista is a form of malware anyway
Ultimately, the ideal would be a combination of the program's dropdown capture PLUS screenshot captor's ability to auto-save and name without insisting on further user intervention, so I can run through the whole process without having to divert my focus.
Working in cubeland, interruptions are all too frequent, so being able to get through a project with fewer sidetracks is highly desirable. If I can make this whole thing work, I'm hoping to sell management on screenshot captor and balsamiq's mockup software to make my life easier here!