Spread in Strategy Tester

 
How do you change the spread? I assumed it was under Symbol Properties, but the field is read only. It appears to use a 0 spread when you backtest.

Thanks,
Bryant Ingram
 
 
Actually, I saw that already and assumed there was a more practical way to change the spread. Obviously, you expected a better answer as well.
 
i'd like to change the spread for particular ticks only

for all of test data you can change it in this way "struct TestHistory in fxt"
Reason: