Just wanted to bump this feature request, even though it seems like it cannot be implemented (like I said, hopefully not just due to limitations caused due to support of minor platforms like Android).
Was working on my mega-game script today and again lamented having to use the standard buttons, which look so plain.
Again, fair enough if there's a hard limit as to why this can't be done, but just wanted to check one last time, since honestly this is one of the things that keeps making me consider switching development of this particular script to something other than SexScripts (e.g. RenPy, etc.)... since SS is *awesome* for the normal kind of linear scripts we all make, but not so suited if you want a custom interface, sadly.