I've just given Minicap a go. There were a few things I noticed:
1) There's no portable version I could see available for download. So I installed it, copied the directory and uninstalled it - and it worked - but it would be nice to have a native portable download for such a tiny useful app
2) The default savefile format is GIF. Really?! It seems to remember JPG when changed, but this is a strange choice for default, I thought!
3) I don't think I can live without the advanced print layout options in Captor - the full-page screendump you get is a bit much, and a waste of ink for me. Unless I'm missing the option somewhere?
Otherwise, it almost works great - and I can see this would be the better app to launch 'on demand' - it's just a bit *too* cut back at present in terms of printing.