Many (most?) toilets around where I live do let you exert "analog" control over the flushing process, at least when initiating it. On the one in my apartment, I

Many (most?) toilets around where I live do let you exert "analog" control over the flushing process, at least when initiating it. On the one in my apartment, If I begin to press the flush button very gently, water will start flowing in at a very reduced rate (and carrying material with it down the drain without causing a splash), compared to when just pushing down the button without any consideration.