Dan,
thanks for your reply about the CAS... That helps answer the question big time!
Also, I have just loaded up the haltech software on my work pc, coil dwell time can be set between 0.2ms right up to 20ms.
....
This is 'tested' on Version 1.11.1 of ECU Manager.
I know they are constantly adding new things to the software + ecu's with each update.... so it may have not always been in there.
Standard dwell on left, max on right for illustration purposes.
Using a R32 / R33 Platinum Pro base map to work off