So, now that I've had my first foray into plugin development for LotRO, I can say that, first of all, it's awesome that we even have as much as we do, and also that the community is superb. Despite the lack of official API support for tracking hits and kills, I'm actually pretty happy with what I was able to accomplish with KillTracker so far.
That said, it lead to a pretty obvious request - official API events for kills, so I don't have to parse chat logs and use fuzzy logic and hit/in-combat matching to guess. This could obviously turn into a huge request, but I think there are some basics that would provide a lot of benefit, not just to KillTracker, but to other ideas as well.
For enemy deaths, I'd need to know if it was by the character, a device of their creation (traps, sticky gourds, etc.) or their pet/soldier, and if so, what they killed. For friendly "deaths" (a possible future KillTracker feature), I'd need to know if it was the player that was defeated, and if so, by what/whom.
Ideally, I'd get actor instances with some nice details about what you killed or what defeated you - level, category (orc, dragon, etc.), type (rare, signature, etc.), name obviously. An ID and support to show tooltip stats like the game does would be ridiculously cool.
If we got that much through an official API, I wouldn't really need the hit data for KillTracker anymore, but I know Combat Analysis would - pretty much just turning the current messages into a class with the bits pulled apart, tied to initiator and target instances that can be compared to each other and to kill event initiator/target instances to know for sure what hits are tied to what kills.