So, while Mike and I have never cooked up an official backstory, we've both agreed that we've known each other since we were kids. I think it would be fair to say that our version of Thief's Cant is unique to us, and can be spoken and written (like any other language), and also hand signaled (with a fair degree of subtlety). The only downfall is that hand signals are limited to simple messages (looking for (item/person/whatever)), (target moving south), (run, hide, regroup), etc. while we'd get strange looks for having lengthy conversations in Cant.
Sound fair to you Josh?
Spoken and written will be italicized, hand signals will be underlined, fair?