You can go to the bug tracker, press "create issue" (upper-right corner) and in the field "kind", select "enhancement" or "proposal".
Hi there. I can't say anything about the logic behind RC4 (since i'm not familiar with it), but i guess it may have decided that based on the contents of the zip. Maybe the file you put in it exists in "mariner", so it got confused...
Well, it might be, but we probably won't find out until you post the data file.