They don't seem to be advertising this feature (which is a shame IMO...). Also, sharing information with (non-SPlat users) on how to load the Splat user-developed themes would be a good idea to me...
It takes a lot of time and talent to create a theme (even just editing a default theme...). The creators who share their work freely, should have their work enjoyed by as many Sonar users as possible.
There are other ways to reward SPlat users with exclusive content and favored pricing.
Just my opinions...
outland144k,
You do good work! Thanks for your efforts! B)