When I create a new map I can save edited map. But I need to try playing it for further step of creation.
In CW3 editor, for example, I can create intermediate variant of map, start playing and in any time save progress, return back to editor (for some proof) and then continue playing from saved stage.
By other words it will be helpful if will be possible to use interface of slots.
I found know-how for this problem:
When creating new map in editor I can finalize intermediate product (map) and then if I play this finalized map (ability for saving in slot exist!) in any time I can return back in editor for redaction of creating map. At the end of creation of map I can re-finalize it. :)
Congratulations, you discovered the preferred, and recommended method of play-testing maps in CW3 and PF. :)
In CW3 direct method. More suitable.