As long as all those involved with this RP fully understand that it is outside of known Settings, does not and will never officially exist, and do not try to force the roleplay on others where it is not wanted, there should be no issue here. We encourage players to be creative in their RPs.
In our observations, there are two basic types of 'rule benders'. The first type are breakers, going against the known Settings by creating plots that are specifically against the known lore, often for their own enjoyment. They will try to bring things into the game that do not fit believably, and try to justify them in vague ways. If challenged, the response is often outrage and rebellious acts.
The other type are those who try to follow the Settings closely while stepping just outside of its bounds to create an enjoyable story for everyone involved. When challenged, they will try to adapt their plots to be more acceptable. Much of the current Settings team is comprised of this type of player, including the Settings team leader, Xillix (claims to fame: Tried to be Octarch, then ran the Laanx Temple), Under the moon (claim to fame: The Un-common Cold), and others to a lesser degree.
The Lore and Settings of the game do matter, and as long as they are respected, a little 'bending' is acceptable.