1."right of return" is not by any means unique to Israel. This same concept has been in play in nations as varied as Pakistan, Ireland and China.
1.(b) The Orthodox in Israel are complaining about Russian immigrants. Why? because 70% are Jewish only by virtue of their DNA.
2.(a)There aren't many muslims "who lived on that land in their own lifetimes" who want to go back.
2. (b)Most of the muslims abandoned their homes of their own choice, wanting to be out of the way while the Arab armies fulfilled their stated aim of killing the Jews.
3. As to voting rights, The Arabs have full voting rights in Israel, which is much more than Jews are allowed in any part of the Arab world.