Hello! Great questions
The protocol development fund on ETH is intended just as the name specifies for developing Saturn Protocol. At this point in time I believe it has not really been touched, our development team hires on demand but as you can imagine the great developers we need are sometimes wary of accepting payments in tokens. However, I am sure as our token becomes more established and awareness grows then it will see more use.
Yes for future blockchains, just like ETC, this allocation will be sold via public sale. One it helps onboard the new blockchain’s community into our own, as we saw with ETC, even though we had announced our intentions of being multi chain there was not much interest from ETC’s community until we started the public sale. Secondly, it allows us to quickly raise funds to remove any blockades from entering the new chain, for the case of ETC, we needed to develop a dApp browser(Saturn Wallet) immediately or our tech would have been unusable there.
The allocation will always be 15%, and I see it being exactly like on ETC, the sale will run until it is all sold. In regards to who decides the price, think of it like this, the developers build the technology and then sell their control of it to DAO - so the price really is kind of arbitrary and would depend on what chain but it would be decided by the development team.