I ran across this while searching Ninja Trader Support Forum. This might be what you are looking for.

Strategy: Synchronizing a DataSeries object to a secondary time frame - [AUTOLINK]NinjaTrader[/AUTOLINK] Support Forum

I think maybe what you are getting at is if it is better to use a simple integer "int" to represent the bool state ie 1 = true and 0=false instead of using a bool.
I have heard that it is better for backtesting but have not read any posts anywhere to back that up.