If it does not need regeneration, it is wise. If it does need to be done, it is stupid to not do it.
You must determine the hardness of the water in grains, then the capacity of the softener in grains and set it accordingly. It may be possible to set the hight of the salt shelf in the brine tank to use less salt but I'm not familir with your model. The manual should give information on doing that.
Newer controls can determine just how much regeneration is needed and adjust accordingly. I don't know if it is possible to retrofit yours to do that.