Not in Outlook 2003 SP2.
Is there a particular reason why you're not using published forms? There are many more ways to launch them. See http://www.outlookcode.com/d/launchform.htm

Signature
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> Want to know if there's an easier way to choose a custom Outlook mail message
> template, than going to <new><forms><choose Form><user templates in file
> system>, then selecting my template.
> Having various custom forms as icons in the toolbar would be great!
> J