Nice to have: HasMany/HasManyToMany PropertyRef with expression parameter

[NOtherDev]

In Fluent NHibernate 1.3, HasMany/HasManyToMany chain offers setting PropertyRef option using string-typed other side property name. It'll be nice to have strongly-typed Expression<Func<TChild, object>> parameter, as it's in References chain.

It is:

HasMany(x => x.Users).PropertyRef("OtherProperty");

Nice to have:

HasMany(x => x.Users).PropertyRef(u => u.OtherProperty);

See also: http://notherdev.blogspot.com/2012/01/mapping-by-code-set-and-bag.html