Guardian query

[Thunderclapnewman]

As a relative newcomer to Guardian I wonder if anyone could tell me if it is possible to automate my strategy.
In certain races I am able to narrow the field down to three possible selections; I then only back one of those selections if it is the favourite a few seconds before the off time. The complication comes in when one of my selections is the second favourite, but is within 5 ticks of the favourite just before the race starts. At present I also back the second favourite in those circumstances. So sometimes I am on the favourite alone, sometimes the second favourite alone and sometimes both. Backing the favourite is relatively easy to set up, but is it possible to automate the other scenarios? Any advice gratefully received