I don't know if this helps but I was recently faced with a problem such as this and my answer was as follows
1) get the user to fill in an online html form
2) when pressing submit it posts the information to an Mysql database
3) When running the flash movie it get the variables loaded by running a php3 script
4) the php3 scrift url encodes these back to flash so that the information can then be read into the movie
I had to put a wait into the flash to allow for the processing but apart from that it works great
The end result is a Flash movie with user inputted data applied into it directly from an MySql database.