Click on the "Common" command and "Common Options" dialog will appear.
You can set there what Generator has to generate.
If the check boxes before Stop Loss, Take Profit... are checked, Generator will generate the particular parameter.

Perhaps generator is not changing BE values to try different possibilities?
If the Break Even check box is checked, Generator will generate a BreakEven in the selected ranges as follows:
The chance of using Break Even in 70 %;
The chance of changing Break Even is 50%
The step of change is 50 points for 5 digit quotation or 5 for others.
Or is this an odd behaviour related to the statistical database?
The statistical Generator DB makes it self-improving. (unfortunately it doesn't work at the moment due to a bug. It will be available in next update very soon). The data base doesn't reflect on Break Even calculations.
in FSB we could have SL/TP/BE fixed. In Pro this is not possible
You can do it by removing the check boxes before the option you want to keep unchanged.
I think that the ranges for the parameters are great improvement in FSB Pro.