I had some success with Adobe Illustrator. It cant open DDS directly, but I can export the file into a PDF format using vector graphics. Then I can import the PDF into Photoshop and convert to DDS. Seems like a bit of work, but for things like line work and getting thing to line up I think would be a lot easier. Rather than repaint a line, you can just grab and drag the end, or add a vertex or change it to a curve... It has a lot of potential I think. Here is some scribbles I did just to see if the export/import works.
edit: I thought PS could open .ai files? Or did you try a copy/paste between the two?
* Just tried copy/paste on my Macbook and you get 4 choices, first one creates a new layer, and then flatten the image to rasterize...or not...I'm not that up to date on these tools.
Edited by Bubba_Zanetti, 23 February 2017 - 04:58 AM.