I'd like to see more control for individual borders in general. In addition to the per border fog settings, you should be able to set things like fortify, attack & transfer individually. For example you can have an 'artillery border', but not a border that is artiller+transfer with no attack.
I think this has been discussed before, but it might makes sense to roll it up into one single update.
Once I have finished the new version of the Player this will be a lot easier to do. It's been on the cards for a while.
How is the javascript player coming? More difficult than expected? I keep hearing about coffeescript lately. Time for a rewrite? ;)
It's going really well. I was hoping to release it to beta next week but I just found a bug which needs a bit of a rework. It's going to make it a lot easier to make fundamental changes like this as the development / compilation / testing cycle is much quicker.