I use ODL and their "MyBroker" software, which has a DDE link. I wrote some Excel code that would "trigger" a trade for Gamma scalping long straddles when 0.5 of a delta either side of neutral was reached. The problem was I could not communicate with their software (via Excel) to automate the trade (sendkeys unreliable). Further investigation revealed that I would need an API, which would need to be written by a specialist programmer. Can you help ?
On the subject of spreadbet options Vs exchange traded options, and to save detailed nitty gritty discussion; you have to ask yourself why everybody doesn't use spreadbets ?