Saving water

The loo in Honebuns’ flat is “broken”—it only flushes as long as you hold the lever down. After getting used to it, I’ve decided it is actually a much better solution than automatic flushing: I get exactly the amount of water needed to flush the current contents of the bowl and my outlay in time is on the order of two or three seconds longer. I’m now peering at my own toilet seat, wondering if it could be modified to work the same.