Tyrone,
I installed Phprojekt using "root" as the login. In my investigation of Phprojekt, I noted that some people had to put in 'root@localhost' in order to get it to work. I also had to paste that long 75-character ldap password into the tiny little box on the config.php page. It took me a bit of messing around with various combinations of username and password, but I believe 'root' and the 75-character password from the ldap.pw file were the winning combo.
As Charlie stated, experienced admins seem to prefer creating a new account for each new db app they install, for the additional security. Since I am still in "quick, dumb, and dirty" mode, I have been implementing all of mine as root. Now that I'm making some progress on understanding this stuff, I plan to go back and create some accounts for the various applications, and get my systems up to 'spec.' For quick testing with minimal learning curve though, using 'root' will get you there.
Dan