I hope it doesn't sound like I'm trying to pick a fight or talk you out of something -- I'm not. As a timber frame business owner and our company's designer, I'm constantly making decisions like birdsmouth over step lap. Which is better? Which is faster (cheaper)? How much better/faster? Is the extra 5,10,30,60 man hours in the frame worth it to the customer? Will they pay it? Should they have to? How much better will their home or barn be if we use this joint over that one? Riven pegs over sawn or turned? These are tough questions to answer decisively. They are complicated by the financial dimension to the calculus. We each get to decide our perspective on this - what we value -- and use that to decide where the line is between cutting a corner and being efficient. That line isn't in the same place for everyone and I like that -- it keeps me thinking about it.


Enough philosophy-

As for uplift, you probably won't need a simpson tie -- but a wood peg may not do it. I've seen square pegs used in old barns to try to add withdrawal resistance. A headed structural timber screw like Dave mentioned has always worked for us and may be a good compromise. We've never had to put hurricane clips on any common rafter in up to 130 MPH wind zones. But YMMV depending on your engineer and the details of the frame and enclosure.