I think there are some straightfoward 'lines', but of course, there's the fuzzy areas. Ok, the clear parts...
RPG topics:
- Anything having to do with the gpt/banking system (jobs, getting gpt for stuff).
Fuzzy Areas:
- Roleplaying the game lifestyle. On the one hand, you're roleplaying events in the game. (going to another city, holding an event in the city). On the other hand (and this is what I thought the Citizens Forum would be for when I first came in Term 1 of Demogame I) city events would have some bearing. (even governors getting citizens to move into their province).
- Groups/Guilds - This seems to be the heart of the problem. One of the aspects of the Demogame RPG, I believe, was to allow players to get a certain amount of gpt for running a group, or paying a fee to join. You would almost need two of the same group in each thread. (one for RPG players, one without)
The demogame RPG was meant to add some spice to the game (since, the citizen's forum could get a little dull with just citizen's groups and discussions). This is definately a tough call. If you wanted some RPG elements, like adding National Parks, they they can't be added on to the constitution if we don't allow the RPG to spill over into the game.
Try to think of it this way...
Citizen's SubForum = a "Citizen's Hall", where discussions are held, and groups meet. The RPG aspect -can- enter the citizens groups (as an option). Groups could be split into 2 catagories:
-- RPG-Enabled Citizen Group - the owner and Citizens can use the gpt/fees if they wish.
-- Game-Only Citizen Group - No RPG aspect can enter.
A note of this should be made in the Citizen Group index.
RPG Subforum = "Daily Life". Just like real life, it can spill over into politics. That's why some citizens groups can be affected. This can be where the game 'economy' lies.

Economy goes bad in the game (which affects the RPG) and the citizens can take it to the groups, or discussions. (to add some flavor).
That is, suppose a civ was exorting us, and taking 30 gold every other turn. A low gold count means a low economy, and would effect 'everyday life'. So, a 'citizen's voice' will call for some action.