extra features in edocman

Hello,
I'm from India, looking to purchase script to sell free ebooks,etc...

I'm also looking for some more features, like

1. visitor has to fill a small survey form, before downloading. (and Survey Info. reporting )
2. can i get PDF stamper, for every download.
3. Can i show cover page of every document

It will be great if you can add this features in current version...I also request you to provide a quotation for above work point wise.

One more thing, if i store my document on remote server, is it safe, as download link can be misused.


Regards,
Deepak