Adding my own MU themes question

We are trying to build our first WPMU blog network which will contain 5 themes (developed by us for our users) as a start so that each new user can select which theme he/she wish to apply for his/her blog

Now my question is...Is there any special requirements, issues or steps I should follow when building any of those themes so that they will be fully compatible with all premium plugins here?

What we are trying to achieve is to build our own themes which will be ready to work with all plugins found here (especially the Money Making, Spam and Multi-Db plugins) without causing any problem or bugs

Thanks in advance for your time and efforts