Feral Heart

Yeah, I noticed that Ruby.
All you need to do is make a second terrain mask,and in the map maker, when you reach the 4th texture, you need to insert the name of the second terrain mask.
Sorry for the suckish explaination, someone else who is better at explaining should do it x3

Yes, there is a way to have more than 3 textures, you need to edit a few files, as soon as I get FH to work again I will test it out and tell you how x3

You can't meet with other players in the map maker.

I used to have that problem too  but I figured it out after all.All you have to do is open the particle file and write the name from there
Like for example , say you want to put the water splash particle.
You have to open water.particle and take from there the name.
Here have a screen shot because I suck at explaining xD
http://tinypic.com/view.php?pic=54vfau&s=7
You don't have to do it with the water particle , do it with whatever particle you have.

Try putting the height map in terrains>default.