What WOULD be cool is having automatic heat-mapping scripted that'll record a map for every spar. You could then give players the ability to browse through past heat maps, giving them an overview of how they've improved over a period of time and an overarching view of how they tend to interact with their opponent in a spar.
If we want to be really clever, we could also programmatically compare these heatmaps against successful players' heatmaps in order to give helpful tips on how to improve.