ROAD DEMON wrote:
... no shortcut for placinng a textured area over a whole bunch of ground boxes?
Sorry, not yet. But it's certainly worth noting for a possible future feature. For now, make sure the sides and bottom are the way you want, then you'll have to go back and do the road curve for the top.
Here's a tip. Toggle ground boxes using the F7 key. Now, copy the curved road to the terrain right below the ground boxes. Put the cursor over the square you want, right click and choose "select". Now toggle the ground boxes and paint the box above the square you just selected. Continue until you get your corner finished. Yes, it's a pain, but at least there's no guess work about which tile goes where. It should make for a fairly accurate paint job. When you're done, just paint over the terrain so that all you're left with is the ground box curve.