so you can embed some standard indis (RSI, CCI, ADX.....) but leave two(three) strings for custom indis of user's choice


example from "TE":

extern int MA_Period = 14;
extern int MA_Shift = 0;
extern int MA_Method = 3;
extern int Applied_Price = 0;
extern double Deviation =0.1;//was 0.2
extern int UseSignal = 1;
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same as if you have this:

UpBuffer[i]=iCustom(Symbol(),TimeFrame,"TrendEnvelopes_v2",14 ,0,3,0,0.1,1, 0,y);


user input will be:

TrendEnvelopes_v2;14;0;3;0;0.1;1;