Here's my L79 support build
DNA is 10 in Lesser Heal, 5 in Swift LH, 10 in Lesser Party Heal.
Maxing all heals leaves you enough points for some offensive skills. Sleep is useful in JS, as is Hush. Bolts are useful if you need to PvP (earn some battlefield points, PK etc).
I guess if you really wanted you could put them into little Divine Protection, or curse resistance, or rejuv mebbe, or survival instinct, or...
hush is only worth to be skilled when it's swifted in DNA i think.
and DNA on divine prot is waste of DNA, coz the only one who could need it is the tank, and tanks can get capped def without any rad buffs. (except you have a defiler or other caster classes tanking, then it might
be worth to think about it. but in most cases this doesn't happen.)
sleep helps a lot in js, but actually you have to concentrate on healing, and have a tempest for sleep.
bolts are also useful in case you have to kill some mobs on your own (e.g. questing).
rejuvenation doesn't need any points (only 1 as filler for lesser heal) coz if you have enuff MND/magic dmg it gives you enuff heal per second.
if i you have another opinion or i forgot sumthin feel free to tell me