[bulbasnore]

OK folks, I've got it working on 3.6.10_pl2. You can do something like this with a SQL statement:

UPDATE `cyb_logintouser` SET `id` = 1, `admins` = '125,3,4', `superadmins` = '125', `lastadmin` = 0 WHERE  `id` = 1;

set this by numeric userid

the admins 125,3,4 appears to correspond to the admins that can log into user accounts.
the superadmins 125 appears to correspond to the admins that can log into admin accounts

of course, SQL is VERY DANGEROUS, so don't use my statement unless you have a backup and know what you're doing. Any damage done to your DB is YOUR FAULT.