Make the roster sortable by assigned rank. This would make it more visible who was the highest ranks within the guild.
I think that when you go to the roster you should be able to have them sorted by the order ranks are assigned in the admin section. This would make the officers grouped above the regular members. This would be beneficial for guilds that do not follow conventional naming for their members etc, members, officers, guild master. Some use creative names that no-one would be able to recognize while looking at the roster with everything mixed together.
This is not currently planned in a development cycle, but we may revisit it in a future release.