I've been on the receiving end of these sorts of comments before, and I cannot convey how annoying this attitude of entitlement is. Someone has worked on this theme, off-and-on, for almost a year. He's built something useful, and he's giving it away for free. If you want a feature, gpmcadam's comment is a good example to follow. Simply point out the missing feature and say how it would be nice to have.

Ideally, submit a pull request. Even if your NetBeans theme isn't perfect, it'll be a starting point for discussion.