You are identifying a wish ...
No, that's just want you want to read. I have no idea why. But it did cause this thread to get hijacked. If you don't like an in-game option to select a heading, that's probably the opposite of what you intendend.
Nevertheless, I'll try to describe the problem to give you a chance to understand it. Spawn point somewhere north of the origin field. Terrain features suggest to place it somewhere east of the intended destination. Then, use the turny-thing to rotate it to point north (that's column 8, it's not displayed in the object properties, so it doesn't have a name I can refer to; also, I don't have a mouse). This yields a "N" button, and vehicles spawn heading north. That's usable to click, but requires to turn to get to the suggested destination. Alternatively, turn it to the east. Result is an "E" spawn button to spawn north, but vehicles appear with the intended heading.
There's a few spawn points in existing terrains where the negative side of this coupling can be observed. Usually the buttons are correct, and the heading inconvenient. To get a proper heading and button this should be decoupled.