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Village Leader Vacation
My idea actually contains multiple parts that could be implemented individually, as well as offering a "bundled" option.
Builders, like all construction workers, love side jobs. My first idea would be to allow you to gem a builder for a week to automatically move full collectors to your containers for you. After all, a Village Leader has enough to do. 25 to 50 gems should give a builder sufficient motivation. Perhaps this could require a builder who is currently as rest, that would be up to you. Could also be combined with a required "purchased" shield.
My second idea, which I believe I have seen before, is to offer a "week long" collector boost for something like 30 gems per collector. If there is a concern that this could pour too many resources into the world, it could be limited to those with a purchased shield, thus you cannot be actively playing multiplayer, though the wars and goblin campaign would be fine.
My final idea would be to package these items together with the week long shield, thus giving a Village Leader an opportunity to take a true vacation; knowing that his village will be both protected and productive while he is away. Perhaps there could even be an option to allow the Leader to indicate if he wishes to participate in wars while away or not, thus NOT be included in wars if he chooses not to be (and not hurt his clan). Just an added benefit of purchasing the Village Leader Vacation package.
None of these changes would be free, all would cost gems, but would give a Village Leader an opportunity to keep his village moving forward while he is away.