Since people have been on this topic for a while, I'd like to contribute any idea that I've found. Check out:
http://www.nippy.jp/en/2013/1141.html
This is a hot melt cementing machine from japan. It has a roller (mine is 3mm wide) and it lays down a very nice and precise line of glue for assembly. When gluing grain side to grain side, the glue is good for temporary holding and positioning. When gluing flesh side to flesh side the bond is fairly permanent. Great for assembly.
The problem is the machine is fairly expensive (~$500) and can only be purchased in japan. I bought mine through a Japanese proxy shopping service.
Anyways, I make a lot of stuff where I have turned edges to need to hold stuff in position for sewing and this thing works great.
Andrew