Huh. Does your console say anything?
There aren't any entries in the console (from either of these two plugins) when I actually scroll and apart from that, after starting up ST2, only the usual entries that they have been loaded.
Reloading plugin D:\Tools\Sublime Text\Data\Packages\MouseEventListener\mouse_event_listener.py
Reloading plugin D:\Tools\Sublime Text\Data\Packages\ScrollOffset\scroll_offset.py