Hi, the bitmap has a pink background in Gnome 2.18. The enclosed ebuild fixes it, and also corrects spelling of "treacherous".
Created attachment 121933 [details] primateplunge-1.1-r1.ebuild
absolutely not. We don't add local use flags and extra deps for dealing with icons.
What's the problem with it? You haven't given a reason. The advantage is optionally not having a stupid-looking pink icon. What's the disadvantage?