[XeTeX] footnotes with opentype superscript, and bibtex with xetex (quotes and hyphens)

[lists+tex+xetex at bueno.imap.cc]

Hi,

I'm rather new to TeX, XeTeX and all such things, so excuse the  
newbie-ness.


First, I'm trying to redefine the footnote reference style to print  
in OpenType superscript, instead of TeX's forced superscript.

This correctly removes oldstyle numerals, but prints a superscript in  
the forced superscript size:
\renewcommand{\thefootnote}{\fontspec{Minion Pro:+sups,-onum}{\arabic 
{footnote}}}

I've included xltultra, which I thought was supposed to fix this, and  
it does for \textsuperscript, but not for footnotes. And I've set the  
font for the document like this:

\setromanfont[%
ItalicFont={Minion Pro Italic:+liga,+onum},%
BoldFont={Minion Pro Semibold:+liga,+onum},%
BoldItalicFont={Minion Pro Semibold Italic:+liga,+onum}]%
{Minion Pro:+liga,+onum}


Second, I'm having minor issues with bibtex and xetex. Using unicode  
input, TeX doesn't replace certain text codes for their correct  
characters (` to ‘, -- to en-dash, etc.). This is not a problem in  
the main file, but bibtex doesn't seem know about this. So for this  
reference

@incollection{Beers1982The-Centennial-,
	Address = {New York},
	Author = {Beers, Dorothy Gondos},
	Booktitle = {Philadelphia: a 300 year history},
	Editor = {Weigley, Russell Frank},
	Pages = {417-470},
	Publisher = {W.W. Norton},
	Shorttitle = {The Centennial City},
	Title = {The Centennial City, 1865-1876},
	Year = {1982}}

I get this:

Dorothy Gondos Beers, `The Centennial City, 1865-1876', in: Russel  
Frank Weigley, editor, Philadelphia: a 300 year history (New York:  
W.W. Norton, 1982), 417--470.

I can replace the characters for the right ones in the bbl file  
before making the final pdf, but is there a way to fix this  
automatically?


Many thanks,
Alex