Use a rule-based configuration system to make configuration infinitely more expandable.

Possible predicates:

• Is a hostile mob
• Mob type satisfies some condition (exact match/in list/from specific mod)
• Difficulty (would solve #3)
• Phase of moon
• Other mods' situations (such as #1)

Possible effects:

• Set detection range
• Modify detection range (e.g. addition, multiplier, according to formula)
• Set x-ray vision
• Set directional vision (as in #4 )

Could use a similar system to loot tables.

This is fully handled in the reworked version of the mod over at https://github.com/Sindarin27/farsighted-mobs