Multi Currency - old patrons vs. new prices

Right now, old patrons will have to pay new tier prices if they switch their currency (say 3 euros instead of 3 USD (about 2,50 euros). Is an option where they will only be charged the amount of their original pledges (f.e. 2,50 euros instead of 3 euros) planned/coming or not?

I just need to know for sure as this decides whether I can use the multi currency option or not.

(I’m aware I can just convert the tier prices without changing them/adjusting the numbers upward, but this will leave me with very messy numbers - and an 85 cents tier)

Thanks in advance!