Hi Neil, as promised, here are some development suggestions:

1- Add an anchor

2- Allow the sheets of both square sails and fore-and-aft sails to be fully eased

3- Allow the rigging to be lowered without furling the sails

Many thanks ;)

The spanker/driver should be able to be sheeted home anywhere from the windward to leeward limit as well as on the centre. 
At the moment the options limit the ability to drive the head to wind and the stern away.