I'd like to use Between and NotBetween operators in the Filter component similar to the available functionality for Telerik UI for AJAX.

Feature Enhancement
Expose Default Operator for Filter fields

Current behavior
Apart from setting FilterExpression to render filed with a certain operator, there is no option for setting a Default Operator for the fields

.FilterExpression(f =>
      {
          f.Add(p => p.FirstName).Contains("Jeremy");
      })

The above renders the Contains operator initially but if you change the field and return back to the FirstName field the operator is no longer Contains.

Expected/desired behavior
Default Operator for FIlter fields shall be exposed

Environment
Kendo UI version: all
Browser: al