Obviously, I support the idea of having a Persian sub-board, but it doesn't look to be a trivial job for the forum moderators and staff, because of the strict need for RTL (bidirectional text i/o) support.
Without this feature, I'm afraid it wouldn't hold enough water, because the majority of its active users would be non-technical members who care about UI and ease of use, ways more than technical folks who typically are not expected to be much of an active poster/reviewer in such a board.