Pros:
This will stop users from pretending they're "Head Administrator" , or any other rank they're not, on any of our servers (I've seen this happen several times). Having this as a rank title can definitely make you stand out more, and will let users know you're a legit staff member when you're replying to server related posts.
Cons:
What if you're staff on multiple servers? I don't think we need something like "SSRP Admin/TTT Moderator/Deathrun SuperAdmin" on anybody's rank title. Now, whenever someone gets promoted/demoted we have to edit this too? What if you're a global moderator or section moderator on the forums? These two ranks will interfere with each other. It creates more of a mess than there was before.
Verdict:
You're better off editing your personal text or signature.
The negatives greatly outweighs the positives for me, so I can't support this. I doubt this will ever happen because of this as well. Sorry.
-Support
Thanks for the suggestion though! :3