Commented by: @aafemt

It doesn't look like a good idea for me. Database cache operating mode and multithreadness are different things, IMHO.

Commented by: @sim1984

As you make a single parameter setting mode server, it may be worth remove utility instsv this is

   instsvc i [nstall] [-s [uperserver] * | -c [lassic]]

Commented by: @ibaseru

so, now we lost fourth mode
SharedCache = False
ShatedDatabase = False

or, this combination was a nonsense?

and SharedCache = true + SharedDatabase = True was equal to SuperClassic?

Commented by: @dyemanov

SharedCache = False
and
SharedDatabase = False
means a forced single connection mode, its value is rather questionable.

SharedCache = True
and
SharedDatabase = True
was not supported in FB3 anyway (error is thrown).

Commented by: @AlexPeshkoff

> SharedCache = False
> ShatedDatabase = False

Single user mode? If we really need it, it's pretty easy to add it to servermode, but I see no way how can it be useful.
PS. sometimes ago interbase had single user connections, some code remaining from it was cleaned up in one of 2.x versions.
PPS. We have a way to shutdown DB to single user mode, no reason to dup that functionality.

> and SharedCache = true + SharedDatabase = True was equal to SuperClassic?

Choice between classic/superclassic was done by a way how firebird is started, not by .conf settings.