Is it possible to list rooms without counting as a ccu ?
As a big part of our players do not play in multiplayer, we want to avoid a user that is only listing rooms to count as a CCU. Are there any means to be able to list lobbies without counting as a CCU ?
No. This is not possible.
You could however of course host your own server, run a couple of Photon clients on that server and let each of them connect to a different Photon Cloud region and idle there in the lobby to receive room list updates. Your real clients could then query your server for the room lists of the different photon regions in which they are interested.