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I've installed and am still testing it. So far no problems.
I love the idea of switching the themes, based on the particular page or module.
I would be interesting to see the same for blocks as well, e.g. to be able to highlight a particular block if the user is a certain page. If doable, you could also make it work with your MyTabs module, so we could control the look of individual blocks in a Tab.
I don't know if the above would too much of an overkill, and I don't know how much resource-intensive would it be - after all, we don't want to slow XOOPS.