You don't need to open a Bugzilla ticket strictly for an enhancement. However you may want to open a Bugzilla ticket to supply a capture that exercises a dissector enhancement (for fuzzbot and regression testing) if one hasn't already been provided. You can then reference the Gerrit link in the bug itself.
-----Original Message-----
From: Francesco Fondelli <francesco.fondelli@xxxxxxxxx>
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Sent: Wed, Apr 2, 2014 9:13 am
Subject: [Wireshark-dev] Bugzilla and Gerrit