Right now the FBA Pack uses Microsoft's function for generating password:
Unfortunately it only allows a minimum complexity to be specified, not a maximum complexity - so at the moment there is no way to change this, apart from changing the code and putting in your own password generating function. Perhaps add it as a feature
request in the issue tracker and i'll consider it for future versions.
In the meantime, if you grab version 1.3 of the FBA Pack, there is no need to go to the database to reset the password. You can use the Reset Password page from the user management screen to reset to a password that you specify.