thank you for choosing to evaluate Test Studio. I will try to answer your question as best as I can.
1) there's no limitation that you can only data-driven post request. Load testing allow you to data-drive all HTTP requests that have query strings
associated with them. It's irrelevant whether they are Get or Post requests. So perhaps you're simply looking at the wrong HTTP request. Sometimes it takes quite a bit to find what you're looking for. I've had cases we're I've had to go through 80 requests to find the one that's sending the user/pass to my Login screen
2) We have several articles have code samples related to accessing Excel in code. For instance check out this article:
You can use code to define your own data-source by overriding the OnInitializeDataSource function:
Some of our customers have done this successfully in the past. Let me know if you require additional assistance.
3) Could you give me some additional details on what you're trying to do. Generally, you're allow to customize the way Load testing works by writing your own custom plugin:
I hope this helps.
the Telerik team
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