Hi,
 
As a suggestion, it might be a good idea to package the STK add-on pack as an RPM that can be installed. Maybe supertuxkart-0.6.2-1-addon.rpm? I don't know about licenses, though.
PS I'm new, so please try not to confuse me.

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SuperTuxKart
supertuxkart.sf.net
stked.webs.com