Comment 3 for bug 369293

unfortunately we do not fire events reliably at all.

I don't know of an a priori way with Launchpad named operations.

I suspect Leonard would have wanted the proposed generic collection-based REST api to normalize these sorts of questions, drastically reducing the number of named operations needed, and thus the amount of analysis we would need to determine whether a given named operation were a modifier. That sounds good to me. I'm sure we could come with other conventions/constraints. None of these solutions are trivial, afaik.