Hi there!
Whenever there's a “quicklookable” item — e.g., a picture, a source with a source picture, etc. — it would be nice if one could simply quick-look the thing (far as reasonably possible through the standard space; or, if not, through a context menu) aside of opening it in Preview or so.
Especially with sources, it would be pretty convenient if one could do this directly from the source list, without having to “Edit source”.
Compare please also somewhat similar enhancement request with URLs at viewtopic.php?f=7&t=1327
Edit: if you consider implementing this, consider please also at the same moment some kind of support for hierarchical sources.
Thanks and all the best,
OC