i've been looking at capture of scrolling windows - i hope to add it in future version.
timer time is configurable in options, (its in general settings tab, far right).
yes, what we need to do is improve object capture mode, so that it 1) works with menus and 2) triggers on like alt+click so that you can use single mouse click to trigger menus even before capture - i'm working on this. it will be solved.