Activate and change Data Slices via Query or Webtemplate

Hello All

Our controllers want to be in charge of the data slices, but we do not want them inside our system. I created now 4 different data slices and I have now two questions:

- Is there a way to activate data slices via a webtemplate or a query?

- Can those data slices be changed via webtemlpate or query, e.g. only lock certain countries or years (maybe with a dropdown box or checkboxes).

Thanks in advance

Clemens