Steve,
Sorry if my childish '12" to the foot' upset you - it's the local way of saying "as per the real worlds" or "to prototype".
I don't know where you are based, but here in the north of the UK I know of no-one with large layout and turnout setting feedback - it's an expensive enough hobby and we prefer to spend the money on other types of hardware.
Anyway, enough of that irrelevance. I haven't tried your:
"In your panel xml file look out for? ?
<signalmastlogics class="jmri.managers.configurexml.DefaultSignalMastLogicManagerXml">
? ? <logicDelay>500</logicDelay>"
Is it OK to play about with these files?? I have a copy of Notepad++ which will present most programming files to me cleanly - and I think XML is on the list.
If it is OK - is there something similar for the turnouts (currently 250 ms I believe?) - if so can you point me at that one too?