Yeah, you're the only one of us with a spare tire.
I agree with you on the sliding bow seats. They always feel like they're about to give. And the little nuts get lost and the seat ends up shifting around anyway.
The advantage is the ability to accomodate different size folks.
Most sliding seats that I've seen make it wicked uncomfortable to paddle bow-backwards if you have a symetrical model.
Rip it out! Put in what works for you.