I will definitely help on WebPositive when I get a chance, but I have been long on promises and short on actual work lately. At least I take part in the community a bit now, which I did not do at all for many years.
Porting more browsers would be good, but if anyone has the skills they should help on WebPositive and our WebKit port for now.
@extrowerk has it exactly right in how hard it is to port a web browser. I did the very, very basic original port of WebKit to Haiku, and then Stephan Aßmus, Maxime Simon, Alexandre Deckner, PulkoMandy and others did most of the hard work to get it to where it is now, which is still pretty far, believe it or not.
Safari is a very fast and power efficient web browser, and it is built on WebKit. WebPositive can be as good if we put in the work, and when we get GPU accelerated graphics it will be just as fast and efficient as Safari. We probably do want to move to webkit2 sooner rather than later, but I suspect there are plenty of lower hanging fruit we could do first which would still help when moving to webkit2.
As I said, I have the interest and the background to be able to help on this, I just need to put in the time.