Second "#of beams" window for Storm Rain when used in dual setup (self-cast and with ballista totems)

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Is your feature request related to a problem?

When two separate Storm Rain setups are present in a build, only one "# of overlapping beams" window is available. This generates incorrect DPS values, as the two skills have different damage calculations based on different supports, but they both use the same window.

Describe the solution you'd like

Enable a second window for the number of beams when a skill setup with a ballista totem + storm rain is present alongside self-cast storm rain.

Describe alternatives you've considered

An alternative workaround could be for the single window to count overlapping beams of all Storm Rain instances at once, but I don't see how it would correctly calculate DPS for those said instances.

Additional context

Current PoB for reference: https://pastebin.com/bpCdMzBY

No file or test is named in the issue. Start by locating the existing Storm Rain "# of overlapping beams" window and the handling for self-cast and ballista-totem setups; done means the two setups can use separate beam counts and produce correct DPS values.