I would really like better user interface scaling too. I was wondering if UI editing could be opened to the public that way we could do it ourselves since it seems to be a low priority. Personally, I have stopped playing since I got a bigger display since the UI is too small.
I'm using 4k TV too! Fixed the problem with the launcher by adjusting the properties of the shortcut so that it uses System (Enhanced) scaling. I run the client in Full Screen 1600x900 because text is still too small when running 1920x1080. Even with it at 1600x900 there are times when I have to move closer to the screen to read dialog screens with NPC's. In addition to that issue, when I alt-tab to read wiki, I would say about 50% of the time it crashes Chrome, have to reopen and restore to bring up my wiki page, total pain in the rear. I would say this really needs to be addressed if there is going to be any future for DDO. I am currently signed up for 3 month sub but will unlikely reup when that is over and absolutely will not buy any expansions if this is not addressed!
Don't hold your breath. Players have been asking for a scalable UI for years, and 4k support. Sev said it was something on their list, but there's no timeframe to deliver it (ie, it has no priority so isn't getting done). The challenge with scaling is it requires every single bitmap in the game to be redone so it can scale. Lots of work and little reward, monetarily speaking.
DPS solves all problems. R10 or bust. Khyber: Ying-1, Kobeyashi