1 - Allow the development team to (heaven forbid) pre-mine some coins for themselves, they get paid when they make them worth something
I am also coming to the conclusion that is the only way to do it because
all other ways appear to be illegal. And that was my original plan in 2014, but was told by everyone that premine was horrible. Yet I've come to realize that every project was premined, even Bitcoin and Monero. There was always some limited number of people who were mining with huge resources at the very start when the difficulty was miniscule.
Seigniorage is inevitable when one creates a monetary asset. It is considered "unfair" and can harm, as such, the monetary belief in the system, but seigniorage will always happen.
With fiat, the seigniorage goes to the government ('s buddies), and people scream "THIEF", but it is just a tax like any other. With bitcoin, about the smartest anti-seigniorage system was thought of: you BURN it. Every coin that is created, has WASTED as much value as it was worth (apart from a small and fair "competitive" margin).
But even with bitcoin, there is seigniorage: the first adopters could get their coins at a fraction of the value it has now. All this "unmerited" value transfer from certain people to other people because of an "unfair advantage" (the monopoly of the state, the knowledge of the devs and their buddies....).
It is inevitable. The only thing one should obtain, is that this advantage gets "washed out" over time. Seigniorage is worse with PoS than with PoW for instance, because initial stakes give you the final dominance over the coin distribution.
But why don't you consider a totally different way of distributing your coin ?
Give yourself a fair premine, and make the coin for the rest a *fork of bitcoin*. So that anyone holding bitcoin at a specific date in the past holds your coins too (and you hold your premine on top of that). As such, you get immediately a distribution everyone considers now as "fair". You could even only accept bitcoin that has already moved, say, at least 10 transactions at a day in the past, so that you eliminate Satoshi's stash.
Bitcoin is a primitive coin, but has one advantage: apart from Satoshi's stash that mostly didn't move, it has a fair distribution that has a certain age. Why not "fork" off this, and take from bitcoin what it did best, and which can only happen ONCE in history ?