After a lot of looking, I finally found a program that works for voice dialing (at least it works on my Toshiba 2032, I am assuming it will work for the Thera as well).
Scrolling through my contacts while driving just wasn't working for me.
It is available as shareware, and only costs $5. The trial version holds 3 numbers, the registered version holds 9.
It is available for trial and purchase at both Pocketgear and Handango, here are the links:

It does not seem as robust as some of the other programs I have seen, but is the only one (I have found) that works with the Sierra dialer.

If anyone has found another, possibly better solution, I would be thrilled to hear about it...

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