After posting my question about fire control and power traverse of 40mm I found a major source of information in an unlikely web site. The Historic Naval Ships Association,
http://www.hnsa.org/index.htm but in specific
http://www.hnsa.org/doc/boforstm252/index.htm which is the US Technical Manual for the 40MM (complete) which also touches on the Canadian and British units and some of their differences.
Yes, some versions had both manual and powered traverse and elevation control driven from a central fire control.
Now I'll go read the manual.