Please add license information as well as a hint to your web site at sourceforge to the CWB module. I could make it easier to contribute.
The information is shown nicely on metacpan at the left side.
Cf. https://sourceforge.net/p/perl-trg/code/HEAD/tree/trunk/Makefile.PL for a nice example for a lot of additional Makefile information.
HTH
Thanks, I didn't know about these fields.
Added to all Makefile.PL's, will be part of next check-in.