The best way to get SJG to stand up and take notice is to talk about FG on the SJG forums. This way the discussion is in their face and the face of GURPS fans who may not be aware of Fantasy Grounds. Talk about the games you play, your love for the platform, and how it benefits your gaming experience. However, be honest about it, don't praise it unless that praise is genuine.
The next place to talk about GURPS/FG is popular gaming forums (ie rpg.net) and social media groups, twitter, etc. This helps promote GURPS and brings in new blood to the community.