I believe that clawhammer technique is especially well suited for jigs. The basic clawhammer technique for 6/8 time has you striking the string with the back of the fingernail on beats 1 and 3, 4 and 6. This naturally accents those beats which are the ones that need to be accented for jigs. If you would like a closer look at how I approach jigs, then check out my "Playing in 6/8 time" worksheet in the instruction section of my clawhammer tab page.
Clawhammer is not "ill-suited" for jigs, it's actually one of the best instrumental styles for playing them correctly!
Thanks... Mike