Probably already known, but those are based on the label width of the dataview.
If I need to work around them to create a custom form fieId in your form I normally just create the "form-group" myself.
The design is:
container - with class "form-group"
label in the container with classes col-sm-3 and control-label
textbox in the container without label and class col-sm-9
No need to say that this is of course not the best way for the maintainability of your code.
i now have this.
but this is a horrible horrible solution
.form-group{
.control-label.col-sm-4{
width: 50%;
}
.col-sm-8{
width: 50%;
}
}