I use LINQ a lot in general, especially LINQ-to-Objects, hence I\'m rather fluent in LINQ.
I was considering to use LINQ-to-NHibernate as the query language for my NHibe
It looks to me as if NHibernate.Linq doesn't support this optimisation right now. I think you'll need to use a criteria query, or HQL, or wait until the fully integrate LINQ provider is released (slated for NHib v3 I think).
Cheers, John