I always try to limit the expansion gaps when gluing down engineered, and probably always cheat the recommended wall gaps so they look better. Haven't had any problems doing so, probably because of the stable climate here. What gets me is that if they want you to leave say a 3/8 gap, if the wood ever expanded even half that much the glue would have to completely let loose. So isn't it just redundant to leave that big of a gap if you're gluing? Might as well just float it if you really stick to those big gaps. I see gluing as a way to give a better looking installation, like 1/8 inch gaps against fireplaces, next to adjacent tile, etc. So do any of you glue down in areas where the boards really do expand and contract a lot, and if so does the glue let loose or what?