The secret to Tried and True is to use it sparingly. Yes, it takes time to dry. It is a trade off for having a non-toxic finish.
Chris Becksvoort (google him) is a renowned Shaker furniture maker and he swears by it. However, I have read somewhere, I can't remember where, that he sometimes adds a little Japan drier to it.
So yes, I have read that adding Japan drier to Tried and True is possible and has been done successfully.