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Sorry, that is not possible as you are telling TBE to RANK the dogs using the trap number so the "favourite" is always going to be the lowest active trap number.
It may be possible to achieve something via a plugin, but I would have to do some more investigation into that.
It is possible if you are manually selecting the trap that you are interested in i.e. the Selection Type on the Ranking tab is set to Manual and you then manually select the runners that you are interested in.
In this case, you can enter 2-8 into the Rank field on the Criteria tab and TBE will only place a bet if the selected dog is ranked 2 to 8 (i.e. not the favourite)
Staking will be overhauled in version 3 at which point these additional options will be added to all relevant staking plans.
I'll increase to 99 (that should be more than enough for a recovery).
Anything else would require more radical surgery - increasing to 99 is a simple task.