Create a feature that allows you to attack your own base
Ever wonder how your defense will do after you have redesigned your base? With this new feature, you can test it out for yourself!
There however should be a cost associated with this feature. As your TH increases, the price should increase accordingly. For example, at TH10, it will cost me 2 mil gold to attack my own base. That will be enough of a deterrent to prevent me from attack my own base all the time.
Best thing about this feature is that it will be for players of all levels. It will give all players the chance of improving their base design skills and also an option of improving their attack skills.