Support "inner line selection"

[vhda]

Suppose the following:

  if (a==b) begin : alabel
    func1();
    func2();
  end
  else begin
    func3();
    func4();
  end

It would be interesting if textobj could line-select (region-type=V) the lines between begin .. end with "vi". With "va" all lines would be selected.
So what I am asking for is a plugin property that enables such selection automatically.

In fact, I don't know if it wouldn't make sense to have the behavior by default when using "V" region type, because otherwise "va" selects the same lines as "vb".