While I agree with this idea, and I also know nothing about coding, I will say it "sounds" simple in theory, but the actuality of it could be very difficult and tedious. I say this because of what benny said below, and that's that each class's spirit gives them a different regen rating, so you would need different settings for each class for each spirit rating, based on the theoretical numbers you gave.
I also have one of each healer type. While using my HPally in LFR I saw at #2 in HPS for a long while, then finally sat at #1. It was using all spells for healing, whereas TuanHA's likes to use a so-called Eternal Flame blanket method of healing. The later conserves mana very much, but the overhealing is almost equal to healing done. Oracle's overhealing was at 13% while HPS was around 35%, so the overhealing vs healing done is very, very good.
I would support this idea, and it's something I wish the developers would support. However, as they've said, it's a raiding routine and not an "overall healing routine", sadly. It CAN be, but it's mainly geared towards raiding. So, I doubt they will consider making all those settings tables to be based on spirit ratings of the various healer types.
Also, certain classes have better mana-regen methods than others. I refuse to lie and say that I know how to play any class by hand. I'm one of those players that needs to L2P his class for each character I load. I've become extremely HB dependent. I rely heavily on the bot and community made routines to play my toons for me, while I just run around. I used to be a macro player. What I mean by that is that I made macros for DPS rotations and tank rotations, I never played a healer because I couldn't macro heal rotations, so I stayed away from them. When I found HB I ventured out into all branches of the game, making 11 toons, and playing all facets of each toon. I have some tanks, some DPS, and some healers.
For me it seems that Shaman have the best mana-regen though, with Telluric Currents. While healing I can spam Lightning Bolt while doing nothing else and bring my mana back up. It's great. I can agree with the idea of basing settings on a spirit rating though, but I can understand that not each toon will work out, so you'd need spirit ratings for each healer type, which means you'd have multiple settings tables based on spirit types, which could end up generating 20+ settings tables to load from. It could get very confusing and frustrating. But, for those of us that aren't 500+ iL yet, or have JUST come back to gaming and enjoy healing, it would be a nice perk to have a routine that "sort of" gives us settings out of the box based on our spirit rating/mana-regen, especially if we have absolutely no idea how to play a healer anymore, or ever, lol.