Easier way to add values to a Webi Input Control's custom list of values?

Is there an easier way to add values to a Webi Input Control's custom list of values?

Currently, one needs to type the value, then click the '>' button:

This process is a pain if you have a large list and/or multiple input controls. These input controls are used to drive aggregation in a crosstab.

Crystal Reports has an import/export feature that would be helpful here:

Could this be done (managing the IC's list of values) using the Raylight REST SDK (v4.2 sp4)?

Can the Raylight REST SDK (v4.2 sp4) documentation be found in a spot that is accessible to the public?