You can create your own trading panel where the user can change parameters during the operation of the EA.
Here are some examples (please run a search in the CodeBase and Articles for more examples) ...
EA - The Simple Trading Panel - MT5
Rodi Chamii, 2021.03.22 19:36
The simple trading panel is a trading tool that is very interesting because it will allow you to predefine your StopLoss and your TakeProfit in term of pips.Ruslan Khasanov, 2012.11.01 14:06
Fast Trading Panel - the panel for fast trading
Great! Thank you so much
Lode

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Hi; I know you can build a "setup menu" that lets users set parameters for the EA. No problem there.
What I want to know is if it is possible to let users enter a value during execution of the EA?
I am presently using the MessageBox command with Yes/No buttons and track the values of the buttons clicked to accomplish this but what I would really like to achieve is for the user to be able to actually enter a numeric value instead.
Input, sinput & extern do not work for that. Is there another option possibly?
Thank you
Lode