but that just doesn't work well in most cases. It only works well if you're looking for errors. Otherwise, you have to load up the whole thing and start from the beginning to properly test. Frankly, it's distracting to have such quick access to the game. I like how Portal 2's editor does it. You can switch modes very quickly (unless you have to compile) and if you make any changes, you start from the beginning. You can still tab back easily if you're comparing something's logic to how it actually behaves, but you still have to play through your level to see the changes.
that makes no sense. there's nothing stopping a player from placing themselves at the start of their map and running through it and playing through it normally.
There shouldn't be, but the engines I've seen always spawn you at the viewport's current position. Now if it could drop you automatically in a bot game or proper sigleplayer start, there would be no problem. There is no use in just running around the world if you know what you're doing, and it just serves as a distraction.
[img width=800]http://gamestatics.com/wp-content/uploads/2012/05/Unreal-Engine-4-3.jpg[/img]That's Unreal Engine...