great start indeed.
out of the box, it already supports a custom image width size (1920px for hd people) making high resolution screencaps (screen grabber is limited to 640px), batch processing of subfolders, background and font color options and it's pretty fast and stable.
like the poster above, i made some suggestions to the author for more customizing power like choosing font face and size (on a 1920px image, the font is a bit small), more metadata display, option to show/hide subtitle rendering and show/hide/reposition elapsed time caption, skip first and last few minutes to skip credits frames, etc.
despite the lack of video and audio metadata, it already replaced screen grabber for me, just because of the output image size.
i also emailed the author about a bug that when you enter a numeric value in preferences, you have to press enter before closing the window or it won't stick.
hope the dev keeps on developing skreenics because the alternatives are not much and not better.
to complement skreenics, i suggest subsmarine (subtitle downloader) and dunex (movie poster and synopsis sheet maker) for those who prefer to maintain your movie collection portable and organized by your own folder structure (essentially, for those who are not big fans of media centers like plex or boxee).