Ah, this explains an issue that we had seen in 4.5 with a somewhat old version of NGUI. The move gizmos were missing entirely in 4.5, even when in 'Handles Off' mode.
That version didn't have the '&& UIWidget.showHandlesWithMoveTool' check, and adding that fixes it.
We're generally using 'Handles Off' mode, as it avoids accidental scaling of small widgets, and makes it easy to constrain movements to a single axis