melee casting requirement

[nilbog]

I would like the ability to control whether a mob can be casted on in melee range or not. Examples include fire giants and nagafen in soldungb. On live, at least the last time I played, you had to be in melee range to cast on these mobs (belly casting), or spells were completely resisted.

Or if this can be controlled via a perl script for blocking or allowing spells by proximity that would be great too. Would fix the North Karana melee binding spot possibly