I think Muzzy is more meaning to address the fuzzy rules and guidelines regarding Roleplaying in PlaneShift. As it stands now, players seem to be encouraged to RP (like the map-loading message that says "you are in a medieval world, roleplay your character!"), but are not required to.
Muzzy (we've been chatting) comes from roleplaying MUDs (Multi-user dungeons, something like a text-only MMORPG) where the rules clearly state that a new player will learn to roleplay in that world, or be asked to find another place to play. There are certainly plenty of alternatives out there for players who are not interested in roleplaying. Entire worlds (A Tale in the Desert, Voyage Century, Lineage 2) where there is no roleplay to be found, despite having a rich setting in which to do so.
Some of PlaneShift's descriptions say that it is an immersive roleplay space, but I am not immersed at all when the bulk of the players around me respond with "It's just a game, get a life" when I am trying to RP with them. With the current set of ambiguous rules and guidelines, I have no way of responding to such a statement other than to avoid that player. Roleplay can be a powerful and magical thing, but it is also a fragile thing, easily diluted and broken. We enforce the rules on character names being appropriate to the settings, perhaps we should also ask that character
behavior also be settings-appropriate.
Going to the movies comes to mind as an example- we have rules there- we are not allowed to disturb the other participants, we allow them to become immersed in the experience. If one could attend the movies without any rules, with people chatting about outside things and running about shouting and generally making it impossible to really connect with the movie, those who wished to truly experience the films would go elsewhere.
I think the non-roleplayers generally see roleplayers as being overly protective of their style of play. As I noted above, we act this way because because it is a fragile thing, not becuase we're a bunch of sensitive artists (though I am one

). I think perhaps the non-roleplayers often don't understand our point of view because non-roleplay is a robust space, one not easily disrupted. If people roleplay near a group of non-roleplayers, their chat is not going to detract from the non-roleplayers' enjoyment of the game. Eyes might roll, and side comments might be made, but those players will not feel motivated to seek out a new place where they can
actually play the game, the way roleplayers must when the roleplay is disrupted.
My two cents

I am in favor of some RP-only space being created. Obviously one needs to allow leeway for newbies, and do one's part to teach those who need assistance.
Having created such a space though, we also need to decide what the boundaries are. Muzzy tells me that one is required to play in-settings (duh) in the MUDs, and that includes going along with what another character may be attempting to do to yours. If one is not comfortable with some issues in the RP, one takes it to OOC discussion for a resolution: "Ok, your character does this brutal thing to mine and runs off. We'll pick up from 10 minutes after the event and go back to IC" I googled a few sets of MUD RP rules and it looks pretty straightforward, but with any consensual space of the imagination, it requires maturity in play. Perhaps it is that aspect the the current PS rules are hung up at. With PlaneShift being free, we do have a lot of youth playing.