Delete = * =BLAGRP !*
That will allow anyone on group BLA delete anywhere... SO you could move your user in that group and let him be there alone...
I'm sure there's also someway in limiting it to user instead of group, I think it was like
Delete = * -BLAUSER !*
where BLAUSER is users account... but not 100% sure about it, u gotta try yourself
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