I think paying with other coins would lose the whole purpose of creating a new coin. If you are getting paid in ethereum and than giving people your new coin that's an offer you make that people will either accept or not and afterwards you will use that ethereum to pay the coders the designers the marketers and everything else but if you pay the bounty people to work for your coin yet pay them in etheruem than it will be "they are not even paid in the coin they are promoting" which wouldn't work.