The tab naming scheme change would be quite reasonable, however what we need to bear in mind is that each set of tabs needs some form of identifier, using the naming scheme you've given an example of above does not include any identifier for a set.
It's certainly a possibility, but i would need to rewrite areas of the plugin to allow this and also come up with some means of identifying a given set of tabs(can't think of any immediate solutions off the top of my head - that's definitely not to say there isn't one).
With regard to bookmarking, it should be supported already to some degree, the tabs script does allow tab selection based on the URL(though i do recall one of the plugin options conflicting with this functionality).
For example, i have 4 sets of tabs shown on the main index of my testing environment, if i visit..
...the fourth tab in the first set of tabs is selected when i land on the page.
...the fifth tab in the second set of tabs is selected when i land on the page.
This only appears to work on the first time you land on the page though and as far as i can tell is a limitation of how the tabs script selects the tab based on the URL, navigating away from said page and back using a different anchor will work(you simply can't just change the anchor at the end of the URL to change tab if you're already on said page).
Which other plugins were you referring to by the way? No reason i can't take a peek at some of their code for ideas... ;)
Thanks for your feedback and sorry for the late response, been a little busier than usual.