Yeah, there's been alot of talk about nori sheets to help with tears. http://www.gentlebirth.org/archives/suturing.html
Truth is, though, if it's a small enough tear for seaweed, then it's fine to let it heal on it's own.
There's an old obstetrical saying that an OB recently reminded me "if you put two sides to a vagina in the forest, they will find each other", meaning that our bodies are meant to heal from most first degree tears.
For uncomplicated vaginal births, most women will expeirence nothing more than a first degree tear, especially if they're not doing forced, counted pushing. First degree tears, for the most part I believe, are totally going to heal beautifully on their own! It's an amazing, most forgiving part of our body.
Of course, compound presentations (baby's born with hands up by their heads) can complicate matters, too.
I just believe that suturing is way overdone and things are messed with too much. I've seen some incredible healing that has really affirmed to me how we need to trust our bodies to take care of themselves.
I think any messing with first degree tears by adding too many more properties to the mucosa will only add to the length of the healing.
There has been some incredible studies done in Europe where first degree tears are NOT sutured and the success and satisfaction rates are huge.
I like comfrey leaf sitz baths or infusions in the peri bottle to help speed tissue and cell regeneration.