Messaging on the pager is currently slow, awkward, and generally unappealing/unintuitive/unfamiliar. Switching each chat into its own box makes most of these issues even worse. By implementing a better messenger system into BYOND's pager, you could greatly increase user's experience and relationship with BYOND as a whole, instead of only using the pager as a middle-man for connecting to their favorite games.
As seen in this screenshot, the steam chat is intuitive and familiar. It shows the name and icon of the person you are talking to, this could be improved to show your own icon as well, personal customization is a good selling point. There is a simple button (which should be more than a small arrow) that opens up interactive options. If you are in a game, this drop down includes an option to invite the player to your server; if they are in a game, it has an option to join them. There are various other points I could make, but you get the general idea...
* Steam provides an excellent example for game distribution mediums.
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