Ability to Add custom "lookup" to other ExpReminder tables

It would beneficial if there was an option to add a custom field to a table, that was a "look up" field, with drop down/search options, to another ExpReminder table.

Specific example: Have a client that is setting up Cert of Insurance policy expirations, that also includes blanket coverage renewals. Ideally wanted to add a link to the blanket expiration to the original policy expiration. The work around was to create a link customer field and "cut and paste" the link to the original policy, but that was too cumbersome. Having a direct look up to another table would be ideal.