Couple of questions

SanDisk MP3 players All other MP3 players
2

  1. That bug was fixed in the first firmware update.

  2. No, if you use the database (the default file selection method), all files are visible at once.

  3. That limitation still exists, I believe. But Rockbox (a third-party firmware that installs in a “dual-boot” configuration) doesn’t share the limit.