I believe that the only solution we may have is to vote for some new merit sources on this forum, in fact I believe the forum needs some new merit sources. I have personally supported @Icopress's merit source application and I believe new merit sources like Icopress could support those posts with some merits. I hope that Theymos should consider appointing new merit sources to help those unmerited posts to get some deserving merits.
The forum users do not vote for merit sources, reputable users apply to be merit sources and Theymos picks from the applications in the pipeline, when he feels there is a need to add new MS to the forum. There are quite a lot of good users who have applied to be MS's and they have been waiting for a long now, but nothing doing from Theymos and i can't really say why; many of them deserve the "job" and they would greatly improve the merit system.