Make Dashboard available in backtest
Create a version with full parameters available and a version with hidden system parameters as below:
Hide strategy source code, only allow external users to input from global parameters (Money management, Execution, GMT adjustment and Orders). 

System settings are hidden (Entry, Exit, Filters etc.)
Make the EA can run multiple instances based on Pair and unique system magic numbers.
For example, in the source code I will include 

EURUSD M5 Entry Type 1 magic number 101, EURUSD M30 Entry Type 3, magic number 103; GBPJPY M15 Entry type 5 magic number 401, XAUUSD Entry type 6 magic 555 etc...
I will input many pairs/ many systems with each pairs into the source code.
 
 if I attach EA on EURUSD H1 chart it will load and run all 2 sub-systems for EURUSD,  
if I attach EA on GBPJPY H1 chart it will load and run 1 system for GBPJPY
if I attach EA on XAUUSD it will load and run XAUUSD strategy parameter 
Basically EA needs to recognize the chart (pair) which it is attached to and run all that pair’s internal systems ( multiple timeframe) based on individual system number and separated parameters inputs.

Also, please give me example on how to input into the source code ( the format).