David
Unfortunately it looks like all the AF lens registration distances are longer than the old Minolta MF distance ... except Olympus:
http://www.rokkorfiles.com/olympus.htm
Canon might give you a bit more room than MAF does so there might be a direct attack.
However i cited a Dyxum thread in this thread:
http://www.network54.com/Forum/259791/thread/1156563304
Which in turn mentioned a Canon electronic adapter which gives AF confirmation for MF lenses:
http://cgi.ebay.co.uk/Canon-EOS-autofocus-module-chip-for-manual-focus-lenses_W0QQitemZ190020651312
Doesn't help with infinity focus ... but sure would be nice:) And might be most of what you want a 58f1.2 lens for:-)