bbPress.org

ok, the following code removes the edit for bbpress, but leaves it for normal wordpress pages

function wpse_remove_edit_post_link( $link ) {
	if (is_bbpress()) return '' ;
	else return $link ;
	}
add_filter('edit_post_link', 'wpse_remove_edit_post_link');

The users will still be able to edit their topics and replies via the in-box edit buttons