Use it all the time ; it is part of personalising/adapting a figure.

First I morph the object file.
Then I adapt the rigging.
Then I set the limits for each joint.

And I click the "force limits" in their parameters palette.

My vote would thus be;
YES: very usefull.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!