I'm afraid it's not possible to create a room that disables chat in HipChat at this moment. However, I can see that there's a similar feature request raised before at:
I would suggest you Vote and Watch the feature request so that you'll receive an update when it is accepted in the future.
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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