There's unfortunately not a way to do what you'd like without some script editing. Technically, if you set the duration to "-1" it becomes permanent, but then it manifests some odd side-effects, like its bonus reading only as "boost" and it being impossible to ever remove.
EDIT:
If you don't mind having no icon at all, you could just remove the
data "StatusIcon"
line in the potion entry.
Last edited by Ameranth; 03/01/17 11:41 PM.