The only way to do it is either re-code it to check for ac_id_pk = 1 instead of ac_user_vc = 'zadmin' making user account Forum Add-ons and Usage the main account (best way)
--or--
add a new user DB table something like 'ac_zadmin_gd' where 1=zadmin user/0=all others ( ac_zadmin_gd = 1 instead of ac_user_vc = 'zadmin') and re-coding everything to look for this new flag instead of zadmin (the way most user-based systems work). This would also allow for more than 1 'God' account which could be a security risk, easily bypassed through phpmyadmin, and would also break the use of the command line 'setzadmin' function.
I found 6 files with 'zadmin' hard coded. It would 'appear' to be easy enough to convert this to either one of the above mentioned solutions.
By using either one of the above suggestions, you could allow the admin to change the username manually in the database (or edit the installer to ask for a 'god user' name).
--or--
add a new user DB table something like 'ac_zadmin_gd' where 1=zadmin user/0=all others ( ac_zadmin_gd = 1 instead of ac_user_vc = 'zadmin') and re-coding everything to look for this new flag instead of zadmin (the way most user-based systems work). This would also allow for more than 1 'God' account which could be a security risk, easily bypassed through phpmyadmin, and would also break the use of the command line 'setzadmin' function.
I found 6 files with 'zadmin' hard coded. It would 'appear' to be easy enough to convert this to either one of the above mentioned solutions.
By using either one of the above suggestions, you could allow the admin to change the username manually in the database (or edit the installer to ask for a 'god user' name).