I am not on the Design Partner program and so have no direct contact with the Lotus development team. So the next best thing I can do is post an idea in the new 8.5 IdeaJam site that I hope will get a lot of votes and show how people feel about the code editors in the new Designer client:

http://85.ideajam.net/ideajam/ibm/85beta/ideajam.nsf/ideajamblogthis.js