Map making: Streams

[BaronvonBeer]

Searched around here and poked through the manual again and couldn't find anything, soooo.

Is there any way to lay a stream in the editor, and get only the stream? If I lay more than 1 hex at a time, without fail, it gets lined with swamp/rough/grass/other stuff I don't want. I only wanted a stream I tells ya!

I can get naked stream if I do one hex at a time, but it results in every hex being a ford.

Thanks for any pointers.