Can I increase the 64K limit of a field?

We have users that have recently converted over to Domino Web Access 6. Our Domino server is currently running on 6.5. The Internet browser on the PCs is IE 6. When our users create a new memo that has a very large "To:" field, they are getting the following error:

Adding entry will cause text list to exceed 64K. Entry not added.

Is there any easy way to increase the 64K limit in this field? Thanks!
No, text fields are limited to 64K.