I've seen a lot of builds that splash two levels of Monk or Rogue, even Fighter once in a while.
I am wondering if taking a level of both Sorc and FvS is ever used?
From what I can tell you are trading some dps for some added support/healing for the party.

Here's all the changes I find.

Loss
Capstone- 1d6 dmg against evil, 2d6dmg against evil undead/outsider
Divine Sacrifice III 9d6 dmg instead of 7d6 dmg
Paladin Redemption III 100% Raise Dead instead of 50% Raise Dead
Divine Might IV +8 Sacred bonus to dmg instead of +6

Gain
2 AP if taking 3rd tier prestige enhancement (Basic Tenants not needed with FvS feat)
Able to take 2 advance beliefs if desired (With FvS feat and Basic Tenants. Eg. An elf with both Unyielding Sovereignty (Full Cure/Restore) and Undying Call (Raise Dead)
~400SP
Every wand usage
FvS Damage Boost I (+2 dmg for 20 sec, 5 times a rest)
2 Fvs and 2 Sorc lvl 1 spells. (Not huge, but can get jump/exp retreat/nightshield for low levels MM and such. They will only last 1 min)

Also wondering if FvS Smiting I effects Divine Sacrifice dmg? (Don't think so, but if it did it'd make some difference)

Anyways, I see people wanting max dps not even considering this, but I think it's a viable option for those trying to be more of a party support person.
Not saying it is THE way to go. Just want other people's thoughts, and whether people do do this already.

Cheers and good day