Proposed :between selector

Hi, I would to know if a :between selector is possible. This selector
would make simpler the next task, underline only the elements between
the first and the list child:

li { text-decoration: underline }
li:first-child { text-decoration: none }
li:last-child { text-decoration: none }

* A
* _B_
* _C_
* _D_
* E

:between would do:

li:between { text-decoration: underline }

Hope that it is clear enough, :P

Greetings

-- 
Andrés Delfino