because within spaghetti code by notch, the block updates are all specific to each block type but the timers use the same variable so for example waterFlow=x and leafDecay=x as well. mods can change this as it is just adding a duplicate var function and the code for random block updates or randomTickSpeed for that block and assigning it anything but x so for example leafDecay=y and waterFlow=x.
answer your question mag?
so the code looks something like this btw:
leafDecay=y;
anythingElse=x;oh as a side note plugins can not do this as they are server side only "mods" and fast leaf decay requires both client and server to have them. its why modding boomed after 1.3 because the singleplayer worlds moved to the multiplayer format