While it is quite cheesy to hit tab - or whatever you have this function configured as - keep in mind that a lot of areas in Ravenloft are very dark! I've found that this function is invaluable in such areas, where I normally would not be able to see items on the ground or some of the smaller monsters coming at me.
The definition of creatures and items in the dark also relies on such things as visual settings and resolution... so the 'halo' also functions as a great equalizer. I know if this function were removed, I wouldn't be visiting such places as the orphanage, where it would be nigh impossible to target the HiPS spamming undead gremishkas amongst all the fog - it's already pretty damn hard to target them *with* the key.