Sorry Dr Ron, not going to be much help. I'm only set up to monitor top horse at the moment and don't really have the programming time to change it to top 4. If I do I'll put a note in here.
As for the other more esoteric stuff you mentioned I haven't tried those options and suggest that a year's worth of data probably wouldn't give enough data in any one set to produce meaningful results.

Chinbok, had a few ideas after the intellectual excersise thread but as soon as I thought of a strategy the goalposts moved - I found a bunch of other variables that needed factoring in. I find that rather than say five neural figures with a minimum total for example - it's better to perhaps set a minimum for 2 or 3 of those neural categories to be sure the horse has (say) at least reasonable recent form and has earned some prizemoney. I've only been playing with the neurals for a short time and am still trying new things willy nilly at the moment.

KV