Zoom control (touch / pinch-zoom) suggestion...

[me.mark]

When using iPad and touch/pinch-zooming the play field, it might be nice to consider how close the mote is to the edge of the play field and smoothly adjust the 'edge-grab' calculations so it does both X & Y adjustments in proportion to the nearest corner location (instead of one at a time?). At the moment it seems to find the nearest edge, then pulls in the other edge, then when locked, it resizes to full play-field. End result would be the same, but it might be a less wild move during the zoom.

[me.mark]

Yes, I know... bordering on obsessive now!

Further to the zoom comment, you could also try zooming out to both diagonal opposite corners (proportionally calculated simultaneously, based on screen size?) to get a totally smooth zoom out?