Daniel,

In order to support features such as the crisp realtime preview of the scaled plant symbol, and the various keyboard commands for things like switching to Copy Along Polyline or Shotgun placement mode, we utilize a custom mouse and keyboard input routine. Thus the only function keys that work are ones that we expressly enable. And the visible glyphs of Osnap mode are not displayed, although we are able to run the current mouse coordinates through an AutoCAD Osnap function. The only issue, is that this is a bit slower than when manually inserting or moving objects, so we purposely do not allow any and all snap modes to function.
We certainly could enable Grid snap, but we already have Rectangular and Triangular array tools that operate much easier, as well as our Paint mode. My preference would be to improve our tools that are already integrated in and easier to use than the CAD Grid settings. But let me know what exactly you are after and we can see what might be best.

--J