Introduce some variation in monster movement by adding and substracting
small random amounts to the fixed increment from the main monster table. The
amount added is potentially bigger (average is +2) than the amount substracted
(average is +1), so monsters will tend to be slightly faster. Probably not
noticeable except for super-slow monsters not being so glacially slow, since
net +1 is a bigger relative increase for such critters' low movement rates.
In practice, the noticeable effect will be that ordinary speed monsters will
occasionally get an extra move even if/when player keeps the hero unburdened.
Possible extension (although I'm not planning to do it): sort the
monster list by pending movement points, so that faster monsters move before
slower ones. The random variation would become noticeable because groups of
same-speed monsters would alter their movement order depending upon who got
a bigger increment or smaller decrement on that turn.
b90d87ec3c