Hit Catcher will work fine. The main difference is that with the api key, MTS will be able to show you the average pay of Turkerview reviews for requesters without you needing to leave mturk to see them.
I am totally new, so reading this, I had the same question. I also need to know something basic...with hit catcher, can you accept several things at once or you have to work on one at a time and then accept as you go. Didn't know if you can accept and reserve a few for the day?
Interesting question. When you accept a hit it goes into the section called - your hit queue. Every hit has a time limit and you'll see the amount of time left in your hit queue log. P.S. This is the basic info, there's a thread in "help and guides" that goes into more detail on scripts. https://forum.turkerview.com/threads/super-beginners-guide-to-scripts.2059/#post-1136643