Featured Items list and questions

Hello,

i used the Component Creator for designing (in free mode!) a little Component for selfuse.
It`s like a List for featured Items.(not articles)
You can add Items and mark them as "featured", but i need to be able to make sure, that only the LAST Item marked as featured stays featured. All the other items should be demarked on the option "featured"... hope you can understand my needings.

Additionally i want to set a Timerange for Items, so that these items get marked as featured only within the given Dates (From Date -> To Date)
My Goals:
- Give Items a timerange when should beeing featured, if needed. (optional)
- Items gets featured when Timerangs is active, and gets defeatured when Timerange runs out, like it`s possible with artivcles.
- Only one items at a time is featured.

How can this goal be reached? Any Ideas or help is apreciated.