They have a manifold there? Sweet!
Don't worry dude, I'd be dreaming too.
I'll tell you one thing - if you have two cylinders anyhow, then at least you're not restricted to have the tanks "geographically" close to each other.
For some reason I don't seem to spill FW (but I spill SW like crazy). I don't know why, it's not like I try any differently. But anyhow, when we moved into our new house my wife banished my SW tanks to the basement in an effort to save her floors (the joke's on her though - we have two cats

Carpet + Cats = "What the heck was I thinking??"). But anyhow, my FW tank wasn't banished. So I have that one upstairs. So splitting a tank wouldn't work for me anyhow.

I am thinking of eventually going to use CO2 on my FW tank but I need to upgrade my lighting first. Anyhow, so having two cylinders isn't all bad. Plus, you can use one as a spare if you end up having to get another one refilled or whatever.