Hi,
before the Chandrasekhar release I contacted all the authors of the cactus thorn PunctureTracker about potentially include it in the Einstein Toolkit. For those who don't know, this thorn (as it's name implies) tracks the location of the punctures which can then be used to move the mesh refinement regions around. It does so simply by shift-advecting the puncture location. The main advantages of using this instead of tracking the black hole location using the apparent horizon centroid is 1) that it doesn't rely on being able to find the apparent horizon and 2) it converts the apparent horizon finder back to being a pure analysis function.
I'm sending this e-mail now to gauge whether the rest of the Einstein Toolkit community is interested in this capability. We can discuss this on the mailing list and/or telecons.
Cheers,
Peter