How about give us a Permission like ignore_client_version to connect?
In this Moment on my Server is 3.5.2 set as Minimum cuz:
1.) The Compatibility to 3.12.1 Server-Version.
2.) To force my Users to update their Client.
The Problem: TS5 Beta 24 is unable to connect cuz of an older Timestamp.
I think at least ServerAdmins should able to connect over TS5 with an Permission like that.