I was trying to come up with a holy/prot spec for end-game that will keep the healing capability of regular healing specs while still maintaining minimal offtanking capability:
Talent Calculator - World of Warcraft
I got the idea for it when I read and heard about a lot of protection paladins finding themselves healing more often than tanking, but when they were tanking they were *needed* to tank. Yet nobody likes to respec several times a week especially not during 1 raid, although if you're *really really* hardcore I suppose this kind of spec is totally useless to you as you can just respec per fight.
What you lose from raiding capability as a healer is imp LoH (which is kinda sad but it's the only thing I think is droppable) and the buff flexibility (buff kings only). In 2.3 (and if you specced into it beforehand) you lose some judging capability (especially the new improved judgement of the crusader). For these reasons this spec is losing a lot of viability when you have less than 3 pallies in a regular raid, so let's make it easy and say for now that it's not worth speccing into it if you're not regularly raiding with 3 pallies, as you kinda want minimum 2 paladin healers.
My real question is not the ability to heal with that spec, that's pretty obvious. What I was wondering is what you'll actually be able to tank with that spec. Obviously crush immunity isn't possible so tanking bosses isn't going to happen, and you don't have the stamina/damage reduction for it anyway. I was wondering more about tanking stuff like murlocs on morogrim, elementals on hydross, hunter pet and/or hunter on karathress, adds on astromancer/al'ar, offtanking void reaver etc. I don't have experience in BT/hyjal so I didn't include any fights there but I was wondering if there are fights there where this kind of spec could swap gear and tank those fights.
For tanking this spec obviously lacks damage reduction and HP buffing and maxed threat but it does have the basic armor/defense and imp righteous fury and seal of righteousness which seem to be the majority of your threat, although it's probably still a noticeable threat drop from full prot with holy shield.
For non-raid content: I doubt this spec would have any difficulty MTing regular 5-mans but would it be reasonable for heroic MTing? It seems to me like at least the easier heroics should be doable with it when you can't find a tank.
Is this spec actually going to be of any use in raiding (of any level) or is it completely pointless and one should forget about it and just choose between tanking and healing?
While I don't really know (which is why I made this post, to see people's replies), I would guess it would fair fine for at least 5-man/heroics MTing and kara/gruul/mag offtanking plus possibly a select few fights in SSC/TK, and if that's the case at least it would be good for fresh-70 paladins who want to catch up to the top-end-game.