Possible to make style names unique?

[greenskye]

Merged ebooks don't seem to be handled well by my ereader app (moonreader) because it doesn't understand multiple stylesheets with overlapping style names. Results in the first book looking fine, but the second book might have everything in italics or everything in header size font, etc.

I can fix this by using the 'arrange into folders' function of the calibre book editor, but wasn't sure if there was anything the plugin could do to give each book unique style names?