Haha lovely, Account sitting - Vacation both same motivation for it, We have 1 founder who was away for days and no problem, that is what council hats are for you, if a founder wants to leave then promote another player to founder that you trust, the point of running and choosing to build a town is that you don't leave it, there is no need for vacation mode or account sitting, I did read the thread budgie brain.
Example: when extending your town that is already maxed out and you decide to build a sister town then you put someone in charge of the mother town (most founders are normally head builders so leave to the sister town), if that person is trust worthy then that's all good if not tough you just got shunted, it's part of the game to encourage team work, if a founder is happy to leave for a sister town then why not just leave for a set number of days and inform the appointed founder?
Either way don't like it.... simple as that.
Oh and let me guess your a founder on some world?