Text/Image based MMO prototype

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PUN's description says its good for any kind of room based games.
The MMO i want to make will have the main realm, and then players need to initiate 1v1 or XvX matches.
So I kind of need room functionality, but also need all players to be in the main realm, where they can travel/chat/trade/craft etc. (a 2D text/image game).

During the battles all I am passing from player to server is couple ints/object back and forth. Does PUN allow such functionality or its server logic can't be changed?

I am building a proper solution with Photon Server(with Unity as a client), but my deadline (uni) isn't far enough to perhaps finish that. Therefore I need to cut some corners just for the assignment for now.

Thanks