In the future, please ask first to clarify what the intended functionality is and how one can set it up. What you describe here isn’t true and it is not helpful to make false statements in the support topic and cause unnecessary confusion among existing and future customers.
There is no sub-category view. There is a front page view and a listing view. Both have their own settings. So if you visit a (sub-) category, you can of course have clickable thumbnail (resolution) images there, if both are options are turned on for the listing view and you make sure that you are using the latest templates.
The other two points are a matter of opinion. You are free to have yours, but that doesn’t mean there is a lack of “refinement for a paid script” on my part.