Richard
I'm not sure what the recommended track spacing is, it depends so much on what you wish to run. In my case, as it is a multiscale/gauge railway, the loading gauges don't match and it is unlikely I'll be running more than one train at a time - I think it would be a dangerous exercise.
As regards rail cant, I don't think Peco include that in their track - certainly the rail tops are flat with respect to each other.