But then who would control that account ?

No one. We can just automate it to set a price for RC in hive according to supply/demand, a bit like eth gas. It requires a hardfork obviously, because that would have to be done using a smart contract.

This is RC pools in a nutshell

Yes, except pools can't charge a fee. I used the word faucet but I meant a pool that charges fees, not giving RCs for free.

I am sure some people would prefer paying one time fees over powering up hive when getting to know the blockchain. Right now, RCs are really cheap so people can buy small amount of hive without worry.

However, if RCs ever become scarce, then people will not want to stake hive for 13 weeks just to try out some things, a fee based approach will be cheaper if markets are efficient.

So long term, fees on hive will be necessary, whether it's done through a centralized app like dlease and direct RC delegations or through a pool like we're talking about.

I think the pool would be much better because otherwise investors who stake long term and loan RCs will have to keep updating their delegations, like on dlease right now.