Hi Warner,
You can currently configure the module title element, by adding this to user.config:
<add key="ModuleTitleTag" value="h1" />
However since it is a config setting it would be global to all modules in all columns in all sites in the installation.
I could see the benefit of promoting this setting to be an instance setting.
I'll add a to do item in my project tracker for it.
Best,
Joe