Using X-keys to exeed 255 char limit macros.

[HPAVC]

problem is, that you can not trigger spells over LUA anymore (if i remember right)

Whoa? Of course you can. How are all these addons doing it otherwise. The issue is automatic/dynamic targeting with addons.

Addons cannot set focus automatically (for example an addon couldnt set your focus to the least healthy character) and then you just '/cast [target=focus,exists] heal. This would be the 'decursive nerf'

That said addons can, using secure templates, and some preconfiguring do quite a big of the heavy lifting they could before 2.0. Such as preallocating UI elements to characters (like how decursive does for each player, pet, focus, and target ... each has a box preprogrammed and you just need to right/left click the box)

[HPAVC]

This addon SmartRes, might be of some use to you. A one button mash to rez people, also prioritizes other rez'ers and what not.

[Zaelar]

You can only do "smart" casting out of combat. Not really an issue for resing unless you are a druid.