I propose this change:

diff --git a/src/modules/m_timedbans.cpp b/src/modules/m_timedbans.cpp
index c4c1fffe4..8d3595846 100644
--- a/src/modules/m_timedbans.cpp
+++ b/src/modules/m_timedbans.cpp
@@ -88,9 +88,10 @@ class CommandTban : public Command
                }

                unsigned int cm = channel->GetPrefixValue(user);
-               if (cm < HALFOP_VALUE)
+               if (user->usertype == USERTYPE_SERVER || cm < HALFOP_VALUE)
                {

To be allowed to use it as a server protection like:

    CommandBase::Params params;
    params.push_back(channel->name);
    params.push_back(time);
    params.push_back("*!*@"+user->GetDisplayedHost());
    ServerInstance->Parser.CallHandler("TBAN", params, ServerInstance->FakeClient);

As a server protection, instead of putting a timeless ban (useless theese times with this "so easy to get a new IP").