Quoted from Aurich:I'm not an expert on the options, but I can answer this one, as far as I know you can buy any upgrades to the Standard that exist except the exclusive LE art package. You can add the toys like the beacons for sure.
I think its great that you can buy all of the upgrades a la carte and get exactly the game you want. Being able to do that without having to jump on an LE early is important to me as a potential buyer.
That being said, it is a little strange the way the site is currently designed. I find it slightly counterintuitive having to click on the Store link first to get to the optional extras page and not having a link to them on the main game pages where all of the features are listed. The descriptions and pictures are a bit lacking also. It could use a little tweaking to better promote them.
http://www.heighwaypinball.com/product-category/optionalextras/?product_view=list