I'm not sure how the current width of a forms column is calculated, but I think it would be an improvement when the broadest total of pixels of a label and field in one column would determine the widht of a column in a form. See my examples of what I mean. When one field is made wider than what is the common width of "label + field width in pixels", the field is placed over the information in the second column (in this case just a group label, but it might as well be a label and field together, thus making it impossible to enter a value in that particular field) .
After making the e-mail field wider than normal:
Calculation of form column width in GUI
Universal GUI
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For the Universal user interface we are going to improve this behaviour so that you can specify the number of columns that a field should span, with any adjacent fields automatically being moved downwards.