Kudos to the NT team.
Here are some enhancement requests.
(1) Show previously created indicators in a chart as an option when selecting the data-series for new indicators.
e.g. Suppose I have Momentum(EMA(14),5) already active as an indicator, then if I want to add ROC of the above, have that as another option in the choice for the data-series. Right now I have to go repeat the process.
i.e. ROC( of Momentum( of EMA(14),5),3)
instead of just selecting ROC of (Indicator1).
When you nest them 4-5-6 deep it becomes error prone since the parameters have to be manually updated.
Initially, it would be fine to keep this just as a UI feature where the existing indicators and data-series are dynamically added to the menu when when creating the new indicator.
An extension would be to tie the indicators together. i.e. if Indicator1 is the input to Indicator2 and you change parameters for Indicator1, then Indicator2 will automatically inherit the new parameters.
(2) A Minimize Right Click menu option along with Maximize, Restore, Move-Up/Down etc. Often you need to add other data-series to create indicators based on them, but you are not interested in looking at those charts. Though you can make the window quite small by using the mouse and adjusting the panel sizes, an option to minimize that window in display would be even better. It could reside as a small icon on the bottom of the chart window available for restore on demand.

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