small questions regarding integrals

In composing a longer piece about concerns here, I have a couple of
smallish, focused questions.  I'll ask them in the context of integrals.

Dave proposes something on the order of

  integral from ... to ... of ... \d x

for an "ordinary" integral.

1. How will we handle the variants on this theme such as multiple
integrals (to be rendered with multiple integral signs), path
integrals, etc. ?

2. Is there a specific reason we don't want to use the TeX-like
notation: \int_{...}^{...} ... ?  (because the _ and ^ operators
become "too" overloaded?)