I know you are talking about door "tie-outs" rather than closures because the Superfly might only have loops at the bottom of the doors. But just pulling those bottom loops together with a "button" and staking the resulting tarp side ends out snug, might be enough.
As mentioned in the tread (in this sub-forum) about the JRB Universal, that tarp - and maybe others or those modified by 2QZQ - have loops down the length of the door for closure. For those, I bought some plastic barrel toggles. they are like a wooded "barrel" button you might see on a jacket, but they are bigger; maybe 1.5 inches (don't have one in front of me). There are two holes in the center and I ran some cord through them and tied a loop. I used the loop to larks head the "buttons to the loops on one side of the doors. The button closes the door using the loops on the other side as a button hole. As far as "stake out" - I just use a regular guy line. I'll be experimenting with Dutch's tarp worms this summer so I may end up with some kind of bungee at each corner of the tarp. But if the sides are pulled out and snug, the door - with "button" closure is pretty secure already.
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