Currently if I select a data element from the pool it is just copies to the text field surrounded with %%. If for some reason I change my data element, I need to find all rules where I used it manuall and change it. If the element would be linked to the rule, a change in the data element name would be applied to all rules. One additional gain would be to be able to see where a data element is actually used.
To be able to see where something is used would also be a good feature for events, conditions, exceptions and actions based on the suggestion here: Reuse events, conditions, exceptions in rules
Community Manager Edit
This idea is also requested by the following ideas
Automatically Update Names of Data Elements Used in Launch Rules
Automatically Update Names of Data Elements Used in DTM Rules