I think it should be changed so that your slowdown period is twice as long as your emergency build period. For example, one fast year (200%) + two slow years (25%x2) is 250% total for 3 years, and will always cost you in total construction capacity in the long run.
Either that or your costs are doubled. Heck, perhaps
both. After all, I don't think you should be using it unless it's an
emergency!
At the very least, I shouldn't be able to get 11 fast build years and then have only 10 slow ones, which is another oddity with emer. build as it stands.
I also think you shouldn't be able to swap out what you're currently constructing with anything else and have all your resources to date apply to the new project with no loss. I mean, here I am working on a computer complex, and BAM, I change my mind and out pops a new space yard that would've taken me 5 turns. While I know it's a game and you don't need to restrict yourself to the contraints of reality, it's nice to be close once in a while. Now if only the real world worked that efficiently.
-Drake
[This message has been edited by Drake (edited 25 January 2001).]