As far as I can tell this is not currently available.

Oftentimes I need to comment out blocks of code and use /** and immediately a */ auto inserted resulting in one extra step. Not a huge deal by any means, but it would be a nice added feature to be able to turn off auto-closures on comments. Or maybe even in the configs an array of chars not to close? If nobody else feels this way though, probably not worth the effort. I suppose I am looking for input on this feature.