You could learn the language of the country from which you get the FoRS 
Pretty sure you could update the NAV with North American maps.
It's pretty cool to be different most of the time. I don't think a RHD FoRS would be a bad thing. You'd definitely have something unique here in North America with RHD.
On a more serious note, it will probably hurt resale/trade-in value as most folks here would probably be looking for LHD. If you never intend to sell or trade-in the FoRS, that won't be an issue.
Pretty sure you could update the NAV with North American maps.
It's pretty cool to be different most of the time. I don't think a RHD FoRS would be a bad thing. You'd definitely have something unique here in North America with RHD.
On a more serious note, it will probably hurt resale/trade-in value as most folks here would probably be looking for LHD. If you never intend to sell or trade-in the FoRS, that won't be an issue.