In this Knowledge Base article, Apple write "With Find My iPhone set up on your iPhone, iPad, or iPod touch or Mac, you can locate, display a message, play a sound, remotely lock, or remotely wipe (erase) your device using the Find My iPhone app from another device (such as a friend's iPhone or iPad)."
This is the closest I have found to a direct statement that it's one package: if it's set up, you can locate, display a message, play a sound, lock, or erase. None of the documentation about configuration mentions options to enable these selectively; the control is off/on.
As far as disabling remote wipe, there seems to be a strong indication that the remote wipe involves rebooting to the Restore partition. Evidences for this include the fact that "Find my Mac" will not turn on (be greyed out) if there is no Restore partition present. Also, it would be very difficult for a running process to wipe its own boot drive. The Find my Mac remote wipe causes a reboot. It seems most likely that wherever the remote wipe lives, it's somewhere on the recovery partition.
So, Find my Mac won't turn on unless there is a recovery partition. Remote wipe most likely won't work if the Recovery partition isn't bootable. To enable Find My Mac but disable Remote Wipe, you need to have a recovery partition, and it needs to not successfully boot. Sabotage the recovery system somewhere so it can't boot and thus can't be used as the plaatform to wipe your main drive. Of course you will want to keep an external bootable recovery drive (USB stick?) available if you do this.