Unfortunately, there is little you can do. The wishlist we have is pretty hopeless and probably irrelevant, but it's a way to give people peace of mind and prevent them from spamming up the board with requests. The best thing you can do is remain silent (I'm certain that the GOG people are doing their best, and doing their best doesn't mean checking the discussion board twice a day to see what people want), not abandon GOG and get a few friends join GOG by gifting them a game or something. GOG should have credibility by now, but having members and sales to show that people are willing to pay for DRM-free games helps in convincing stubborn developers. Not much you can do about copyright issues though.
One more thing. A GOG member made an
unofficial wishlist - I don't know whether this has registered on GOG's radar, but at least it's less of a mess than the official one.