It would be very nice if the GUI tries to keep fields belonging to a group together. Such as the option 'Keep together' in various reporting tools.
Now it may happen that only the group header and the first field stay at the bottom of the form and the remaining group members are being moved to the next column or tab, while there is plenty space in next column.
Yes, would be a good feature and will improve usability! Now it is confusing for the end user where field go in certain scenarios.