Adding Seltzer to the Soda Dispenser and Other Drinks

[CrackBauer]

Having a dispenser filled with various sodas and juices is nice, but why plain seltzer is out is puzzling. It opens the barman to a few more cocktails and if you toss in some sodium, you've got club soda. You could even mix it from the chem dispenser if you wanted ((carbon+oxygen)+water). Additionally, I looked up some other drinks that can be made with the current ingredients.

Black Russian: Vodka + Coffee
French 75: Gin + Champagne + Lemon juice + Sugar
Mimosa: Orange juice + Champagne
Negroni: Gin + Vermouth + Bitters, orange peel optional
Necroni: Same as above, but add Ectoplasm.
Rob Roy: Whiskey + Vermouth + Bitters

Anyone want to weigh in or have other suggestions?