Possible implementation:
1. [optional] Add property to indicator base class: IsMultipleInput with default set to false
2. [optional] If IsMultipleInput == true:
3. when selecting Input Series you can use CTRL + select to multi select instruments.
4. This would require new overload to indicator, eg: Indicator(ISeries<double>[], parameters...)
5. The indicator would have to be designed to work with BarsArray[], hence the [optional] idea for new property.
This would allow to create and indicator that would serve as an easy way to create custom indexes which would be a welcomed addition to the new NT.
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