Hi, thank you for the positive feedback.
That is a good question, and it is something that has been on my TODO list for a while.
The Woo Themes themes, by default, only support three weights (300, 400, 700) and their various styles (normal, bold, italic). Both the standard Woo themes and my plugin will load up all the available weights, so that can be a bit wasteful of bandwidth if you are only using the three weights that the theme provides.
I'll take a look at this soon, as it is about time I did some updates, since we are approaching another thousand round number of downloads, and it's nice to celebrate :-)
So the idea would be that in the admin page, you can select which weights are downloaded. It will default to 300+400+700, but you can select additional if you want. The weights would apply to all downloaded fonts, and would not be different for different fonts. That would be nice, but I suspect a bit of an edge-case use weighed up against the effort it would involve. But we never know where this thing may be heading.