If I'm able, are you interested at all in having some old systems RPG music put on the playlist (like Amiga, Commodore 64, etc.)?

Yes
No - I generally prefer music from the NES and on
Don't really care

Sometimes I don't upload songs that are less than 30 seconds long. How do you feel about this?

30 Seconds is a good minimum length
Songs should be at least 45 seconds
Songs should be at least 1 minute long
Songs should be at least 1:30 long
Songs should be at least 2 minutes long