I'm just reading your question about using the scrollbar to navigate and clicking on seperate items to perform an action. The "proof" you attached in your question is just about exactly what i'm trying to make.
Do you already have your problem solved? And if so, can you tell me how?
1) Select your datalist
2) In the interactions panel, choose "Add Interaction"
3) Choose "On Select".
4) Change "When Any Item is Selected" to "When a Specific Item is Selected"
5) Enter the 0-based index of the item in question (the first item is 0, not 1!).
6) Now, whatever you make this interaction do will happen when you select that item.
B) There is no way to hook a slider up to something in FC in the current version. If you have ideas about what you'd like it to do, post them to the ideas page: http://ideas.adobe.com/labs