[Regression] Creature spawn rates are lower than in Morrowind

The OpenMW wilderness is empty compared to Morrowind. In Morrowind, you are constantly attacked by creatures, and if you re-visit a cell you have cleared, creatures will re-spawn almost immediately. In OpenMW, there are fewer creatures and they re-spawn rarely. I walked from Aldruin to Ghostgate and got attacked by one Cliffracer. About five game days later, I walked it again and was not attacked once. In Morrowind, you would run into a half-dozen cliffracers every time you made this trip.

(RM-2365 from redmine: created on 2015-02-11 by Gordon Hales, , closed on 2015-02-11 by scrawl .)