So that's a no.
Our algorithm for quantifying sessions - and one of the KPIs is "number of sessions" - is to look for breakpoints between user activity. This requires a full trace of user activity, not just map-related user activity (going more than N seconds without seeing a map does not mean the user stopped browsing). Without a full trace not only can we not hit one of the baseline KPIs in any way we can't hit what is the logical extension of it (the proportion of sessions that involve map activity).
It's my understanding from this that the EventLogging schema that was written above does not capture data to display some of the KPIs. I will get confirmation from Tomasz that he's okay with this before marking as resolved.