Is it possible to create scatter plots in C3 UI Framework (ie. non-timeseries, dual-variable plots)?
Which component are you working on? Scatter can be used in multiple Chart Component with proper configuration on series.
i.e: UsageAndEvent, set chartType to scatter on each series will give you scatter chart.
Is that also supported by MetricsChart?
Also, for either UsageAndEvent or MetricsChart, can I configure a mix of line and scatter styles for different timeseries?
Try userMetricConfigs field on MetricsChart. For UsageAndEvents, you can use different style for different timeseries.