When it comes to the central moral question of our day, whether or not the God-given right to life is unalienable for all persons, including the child in the womb, Ron Paul and Sarah Palin's positions are identical. They are pro-choice for states. [see Palin/Gibson interview below.] This was Gerald R. Ford's position, not Ronald Reagan's position. President Reagan was personhood pro-life, and believed that the right to life of all was protected by the Fourteenth Amendment. That view was asserted in the Republican Party platform beginning in 1984 and is still there to this day, though you wouldn't know it by the positions or actions of the GOP's politicians or nominees. John McCain holds the exact same position as Ford, Paul and Palin, by the way.
Charlie Gibson interview with Sarah Palin
[Charlie] GIBSON: Roe v. Wade, do you think it should be reversed?
[Sarah] PALIN: I think it should and I think that states should be able to decide that issue. Video
No one can rightfully claim to be "a mainstream Reagan conservative" if they think states can alienate what the founders called God-given and therefore unalienable.
The founders left it up to the states to make laws on when and how taking life was punishable. They did so just fine until SCOTUS usurped that power in Roe v. Wade. To want it repealed and a return that power back to the states is the conservative position. In that Palin agrees with folks like Rush and Antonin Scalia (who are not Reagan conservatives by your definition either). To have the Federal Government dictate it to the states is radical, not conservative.
As for whether abortion is the central moral issue of our times, there are many reasons for people to disagree. You are entitled to your opinion.
Sorry, but Reagan's son, Michael, disagrees. And when we want an opinion on who is or is not qualified to be referred to as a 'Reagan-conservative' the opinion of a shill for an irrelevant third party will not be sought.