Can I customize the icons, or remove the option for posters to select a Message Icon?
You could select an alternate set of icons, but there is not any way to use your own custom ones. You could also disable them completely if you like.
1. Log into your Bravenet account
2. Click on the Web Tools tab
3. Click on "Message Forum" in your list of Web Tools
4. Click on the blue "Forum Styles" button
5. Click the Icons tab
6. Select the icon set you want, or select "Disable Message Icons" not to use any
7. Click on the Save Changes button