Thanks for the suggestions, some are really good and under development...

Q1. Please add seedphrase wallet generation option.
A1. We are working on an upgraded codebase, this will be available at that time

Q2. Please add "number of threads using in mining" argument in zillioncoinhd daemon.
A2. possible, just put "genproclimit=x" in zillioncoin.conf

Q3. Please add option: "send to wallet all avaible coins, when you have mined new block".
A3. we are currently working on this, should be available in the next upgrade

Q4. Is it possible to add an option that will allow you to avoid downloading full blockchain
A4. We have considered an SPV version of the wallet, this is a lot of work. It is possible you will be able to do this in a more simple way when we release our API (still working on this)

Q5. Don't you wanna make zillioncoin forever cpu-only
A5. We would love to do that, the problem with CPU only is that at a certain moment, when total nethash is too high, there is no more ROI for anybody.

Q6. Is it possible to add zillioncoin to barterdex decentrilised exchange using atomic swap.
A6. We are working on an upgraded codebase, this will be available at that time