Yep the zipper and wet door sucks, I just put about 2' of string and let it lay on the ground.
Being in NM I often pitch it with a gap at the bottom and use a screen door and it is usually bearable.
I have really wanted to add 6 inches of mosquito netting at the bottom, maybe a 12" piece of netting edged and little strings sewn on every 2' and then have little loops that match sewn on the tipi, then I could just tie it on the outside of the tipi after it is set up. I've had some gnarly spiders crawl on me and I have just swatted them..........okay I've slapped the shit out of myself! the clincher that made me want some netting was a close encounter with a big ol black widow.