Village test : attack your own village to test it
I think that there should be a New feature that let's you attack your village in a testing/experiment screen so you can see how your village reacts and stands up to your own attacks and to different strategy. Also see how safe or well protected certain areas are, also there should be limits on what troops and what levels you may use based on townhall levels. There should also be a cool down time on this maybe 5h that can be spedup or bypassed with gems
Stuff that you guys suggested that I think is great
That you have to train troops to attack this village
Disabled during war and war prep
Possibly sandbox clan members