It would be nice if we could add a custom number formats/notations to the list of notation formats in the drop down menu for record formats.
e.g. someone requested to use dots instead of dashes in a date notation, but if you set the record as number>date you can only use the predefined formats which use the system setting for separators. However as I work internationally I run into the issue of dealing with multiple date notations, so I simply use a text field to avoid reformatting issues based on system settings.
The same applies to decimal separators, sometimes I have to use a comma and sometimes a dot. For thousands separators it can be a space as well instead of a dot or comma.
Issues like this could be solved by allowing for custom number formats to be added to the list of available notation formats.