CMS Made Simple Forums

Hi, I have this problem. We need the privat section on our new sport club site. I did this with FEU and custom content modules. We also need to allow to all members adding news and uploading files or creating a new photoalbum (I could set this thing as group properties in the admin panel). I've got an opinion that it is not good idea to have every member in user table and in feu_user table as well because in the case there are two usernames and two passwords for each user (e.g. when he/she wants to change the password it brings problems). I think that I could change the query when a user log in. I could redirect it to the one of the tables (user or feu_user). But when I'll upgrade the feu module or the core the query will be probably replaced back to the appropriate table. Do you have any idea how to solve this problem? For example with some user tag?
Thanks