>I was looking for a plugin to cleanup oversized images on my frontpage and in blog/article layouts and this does it great. Two things missing - I'd like to be able to easily tell it to not thumbnail ALL articles, just do if for the frontpage/blogs.

Good idea! In next version will be.

>It also would be great with an easy way to change the margins around the thumbnail. It may be their but I couldn't find it.

Please use classes "juleft" and "juright" for change margin in your css.

Look example:

.juleft{
float: left;
margin: 0 6px 6px 0;
}
.juright{
float: right;
margin: 0 0 6px 6px;
}