XF 1.5 Automatically apply specified prefix to new threads in specified forum?

[BlackGrenade]

I'm currently working on a forum and I need a support forum.
Is it possible to make it so when a user makes a thread in the specified forum, that a specified forum prefix is applied to the thread.

For example. A user starts a thread called "Help me with xenforo" and it automatically has a prefix that cant be removed by the user saying "support required"??

Many thanks for anyone able to help me.

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I've just discovered the setting to require a prefix, but no prefix is still an option. can this be disabled?

 

[Martok]

I've just discovered the setting to require a prefix, but no prefix is still an option. can this be disabled?

If "Require users to select a prefix" is checked, then users will have to select a prefix in order to post. It is only moderators who can bypass this, as explained in the descriptive text.