* Site Settings > Miscellaneous > flvtool
Allow admin to enable or disable flvtool meta injection.
Don't you just love explanations that tell you less about stuff than you knew before!!

I have used vshare for more than a year and I still don't know what this means.

Debug mode: adds a text log file in your "templates_c" directory so you can trace problems
Captcha: puts in the cryptic picture so people have to type the letters before registering, so that robots don't register 100 new users every night.
Video Processing: Real- Upload and it will show up right away. The others are for using cron to process the flv files later or in batches or in intervals of x number of minutes.
Guest Limit: Try set it to 1. Not too good eh? Unless you have a registration system and then it forces them to go register before they can see any more. A big number is just so it never blocks them out. AFAIK the number is in minutes- not videos.