No, the "with" keyword was intentionally left out of the language.
If you have a lengthy name of reference, you can easily make a shorter reference to it using a variable, and even give it a limited scope:
{
SomeClass r = Some.Lengthy.Path.To.Get.To.A.Referece;
r.Some = 42;
r.Properites = "none";
r.To = 1;
r.Set = null;
}