Regarding point #4, I've seen this too, and I suspect it is because up through that version the map compiler (ufo2map.exe) was worked on and tweaked many times and yet most of the maps were not rebuilt because the actual map source files were unchanged, and the script for compiling them was set at the time to only rebuild updated map source files.
I haven't tried this with an installed development build, but I'd imagine it would be possible to go to the folder "contrib" and then "scripts" under the installed folder and run the "compile_maps" batch file with the "/clean" switch after it to rebuild all the maps with the updated compiler, and this could probably be done without Codeblocks, without SVN, or any other programming tools, and be very easy to do.
I must warn you - rebuilding all the maps can take hours, it might be best to do it overnight if you try this.
For the next build I upload and link to, I plan to do this beforehand so this won't be necessary.
I'll try to upload a new one with re-compiled maps within a week, if my schedule permits.
Regarding your other points, the developers will need to address those (if they aren't on vacation for the holidays).