There isn't. When you reload, Sly has to re-snap items (if you are using itemNav) due to the changes in sizes, which inherently changed item positioning offsets.
The moveStart event is triggered when Sly starts moving. That happens because it has to re-snap the items (described above).
Also, .stop() method, as is described in the documentation, stops only a continuous movement animation initiated by .moveBy() method. Nothing else. It won't stop any other animations.
Making reload method smarter so it would work better when called after you resize items in forceCentered navigation is on my do to list, but no ETA.