I'm afraid HipChat charge based on the user per groups so you can't separate your user to which will use the plus and which will be on basic plan. So basically if you have 10 users then HipChat will charge you 10 users x $2 per month = $20 per month.
...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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