Reduction of Casting and Production Points

Do the changes to permanent MP and SRP affect rituals already cast?

Example: Bellanear has cast Ritual of the Exemplar (4 permanent MP).  Do the MP used retroactively become SRP, or am I out 4 build?

Further Question: For Rituals Like Exemplar (where the Permanent MP/SRP cost is not a multiple of 3), what happens?  I obviously have to spend 2 mp (to get 6 SRP).  Do I keep the extra 2 SRP as a reserve for future rituals, or do I lose them?

To illustrate my question better (I'm worried it may be a little confusing):
Bellanear has 39 build in MP.  As a mage and a High Elf, he now has 43 MP.  However, there are 4 permanent MP marked off his card (for the aforementioned ritual).  Which of the following 3 scenarios occurs?
A: Bellanear has 39 MP.  Sucks to be him.
B: Bellanear has 41 MP.
C: Bellanear has 41 MP, and 2 SRP to be used for future rituals.

Concern Regarding Light (all varieties):

Light exists now as a purely RP/safety spell.  MP is an extremely valuable resource now.  Is there any possibility of returning Light to a casting cost of 0?

EDIT: Ditto on the above question for Germinate.

Concern regarding Gust (both magic and druidic)

Even at an increased distance, gust remains a very inefficient use of MP. 

Suggestion: make it a 'trip' spell in line with freeze ground and vertigo.

I will work with anyone who has invested perm MP make sure they do not loose anything from this.

With regards to investments, how does this affect the investments in the focus in terms of the total amount and the differences between priests and healers?  Also, is it safe to assume that the relative levels of the ranks of the focus will be adjusted as well?

Re: Gust of Wind/Forceful Gust- Why not just make it work like a throw?

I know I am only have a general knowledge of casting, but light used as a device to see where you are going in most cases last very little time (Under 30 I'd say). Perhaps if light (in all forms) were free while in hand, and cost to be placed on objects. Using the math here, light wouldn't equal a buff, debuff, defense, or an attack. The spells made for roleplay in this new system are in decimals with this drop.

Perhaps a cost at a certain point would make the point worth it. (Since it seems points are becoming more valuable.) After the first 30 minutes, light costs a point.

That way, all that would hold you and light is verbals. Extinguish (Divine) would still be a point, but to make it 'worth' it, perhaps a mage must wait fifteen minutes to cast light for free again, or spend a point.