I would like to expand this plugin to have a couple more widgets:
1) Category View: show all the products in a category,
2) Latest: show latest products (per category if specified)
*) Maybe paginate it as well with http://wordpress.org/extend/plugins/widget-pagination/
...do you use the wp svn, or do you use git? Anyway, I will use a local git repo. I could (git) push the changes to you, or I can just put a tarball somewhere and you can use the additions if you want to.
BTW: Your plugin is called, "ecwid-useful-tools" but your class and config names all look like, "EcwidRandomProducts", so I will probably generalize the germane name space to "EcwidUsefulTools"