I'm really happy to announce that starting from the build v220.127.116.11058, you can now write your own templates directly from Visual Studio 2008. You will then benefit from all the good Visual Studio features such as Intellisense, debugging, syntax coloration and so forth!
I have recorded a webcast to demonstrate how to install and use this new feature. You can find it in the Resources section of OlyMars Refresh portal. You will find below a screen shot of a table based template written inside Visual Studio 2008.