sadly you can not do any of the things you asked with out working a deal with your oppenent.
let say if you wanted to make a wraithlord a sniper with the brightlance you would have to give up something to equal out the extended range.
like if you wanted to add 6-12 inches on the range i would suggest lowering his armour value.
the rules we create are simply for fun and can not be used in rogue or official tournaments.
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