If you want to add something to the bread dough during the knead cycle, and
you don't want whatever you're adding to be beaten to bits, do not add it at
the beep. Wait until the machine is about two minutes (or even less,
depending upon what you're adding) away from the end of the knead cycle, and
add the raisins, or whatever else, at that time. This will give the machine
time enough to incorporate the material into the dough, but not enough time
to knead it to death.
If you are adding raisins, instead of dumping them all into the bottom of the
pan at once, try dropping them into the dough a little handful at a time. If
you keep dropping them into the turning dough, you will see where they are
and where they aren't. This method will assure you of a more even
distribution in the finished product.