[jurialmunkey]

Didn't even think of using that.

I had to set the query using a property because it wouldn't work using $INFO[ListItem.Title] in the list itself.

xml:
<onfocus>SetProperty(SlideshowActor,$INFO[ListItem.Title],home)</onfocus>

xml:
<onclick>SlideShow(plugin://plugin.video.themoviedb.helper?info=images&amp;type=person&amp;query=$INFO[Window(home).Property(SlideshowActor)],beginslide=$INFO[Container(500).ListItem.PicturePath])</onclick>

Only problem with that method is you can't override the pan and zoom effects whereas you can override the random one.

EDIT: Found an easier way to achieve the same results.

I know you found a different method but for future reference the "pause" param will disable pan/zoom in the SlideShow and allows you to use right/left as gallery viewer
e.g.

xml:
<onclick>SlideShow(plugin://plugin.video.themoviedb.helper?info=images&amp;type=person&amp;query=$INFO[Window(home).Property(SlideshowActor)],beginslide=$INFO[Container(500).ListItem.PicturePath],pause)</onclick>