I assume you want to have more data in EA Studio...

The recommended way to do it is to export data files from MetaTrader with the provided "Data Export" scripts and import them into the application.

However, if I have to answer your questions precisely:

> Is it possible to get more than the current handful of indices into the Premium Data?

You can get as many symbols as the service provides. It is not possible to get more than that.

> is there an easy way to export Tick Data Suite data into EA Studio?

I'm unfamiliar with this service and the format of their data export.

You may try to import data from them in MT and export them later in the described way.