The reason Im reading about sailing canoes is their waterline shape and size is not that much different from the yaks we use today, so why reinvent the wheel when not so long ago adventurous people like us already made very efficient sailing rigs using nothing but the handtools and materials ie; timber, rope and canvas avilable at the time.
So often when I search for modern yak sailing rigs I find very small sails and everbody is so worried about tipping over that they automatically fit amas even when using these small sails.
have a look at this very old you tube vid, dont worry about swastikas on the sail, before Hitler used it they where both a good luck sign and a religious icon.
First thing to notice is, whoooohooo check out the speed this guy is doing
imagine how quick you could do a long distance trip at that speed 
, second thing is look at the size of the sails and, where are the amas??? he even stands up when pulling into shore, no wonder he's smiling at the end of the vid, if I could get my yak to do that sort of speed I reckon Id be grining from ear to ear like a fool too, so would just about any one 
.I'm prettty sure that the sail rig he is using is a fore (forward) "Lateen' rig with a smaller aft (rear) mizzen sail. most of the info I have gathered indicates that alot of sailing rigs used this two sail rig, the mizzen was rigged loosely and generally looked after itself with the sailor concentrating on the mainsail. A leeboard is used either side and these where usually up to 90cm long and almost 30cm wide.
Cheers a very bored Ghurkwin
) and 2 for when the wind is really up and I want to go sailing. Still yet to test that though.
ok I didnt read that one properly