Well, yes and no. You can have one or the other, not both, unless you introduce another program. To swap from sand to dirt, look in the Betweentrans.txt file and you'll see some lines like this:
Code:
00 02 Grass2Water-Light.txt
//00 02 Grass2Water-Dark.txt
Just swap the '//' to the line you
don't want to use and you're off. In the code above, you'll get light colored coasts.
To use both transitions on the same map requires another program. You'd have to compile the map (or parts of the map) with one coast type, then compile the map (or parts of the map) with the other coast type. Finally, use a program like UOCopy to copy the parts of one map into the other.