I have come across the situation where a bridge couldnt be placed not because of illegal features on the tile or the tile next to it but because tiles further away maid the bridge unplaceable.
your double etc bridges coulde overcome this, provided there were a string of such bridge landing spots
I think it would be cool
you could start with 1 of each extended bridge in supply
have you considered "corner" bridges?
my the possibilities
but as trebuchet points out there could be a cost factor
you could have a free bridge placement per turn and a "move the wood" bridge placement as an extra.
I wanted to make extended bridges exactly for the reason of branching over say a football city or anoter two tile wide feature.
I have thought of corner bridges and it is a bit mor work but i could pull it off. If you are going to go that far we could start talking aboutall sorts of diagonal bridges but i will stick to the basic corner and double perhaps tripple bridges max.
I would treat them as regular bridges, you wouldnt get alot of them so its not a ton of free points or anything it will just help make for some interesting plays.
The slope idea is interesting but I don't think it would be compatable with alot of tiles, i think that is why the original ones are shaped the way they are.
WHILE IM AT THE JIG SAW MAYBE I WILL MAKE SOME TROLL MEEPLES AND SEE IF AN EXPANSION HAPPENS LOL.