If the nuke Israel crowd wants right of return that basically means they want Palestinians to die of radiation poisoning
This is totally divorced from the reality of the Israel/Palestine conflict. Right of Return is, at this point, basically a symbolic demand that Israel recognize the illegitimacy of the Nakba. The formulation Palestinians proposed in 2008 was, Israel agrees that refugees have a theoretical right to return, but the exercise of that right in practice can be curtailed to token numbers, with Israel controlling the flow, so that Israel can maintain Jewish demographic supremacy indefinitely. Basically, the Israelis are being asked to give up a little bit of pride in exchange for peace. As such, it's one of the few Palestinian demands which you genuinely cannot claim harms Israeli security.
So, contra what Derek is saying, Right of Return is among the best terms to compromise on. It means very little to Israelis (they keep their land, their security, their Jewish majority) and it means a lot to Palestinians. It's a great place for negotiators to bend.