larian could at least allow for buying the electronic addons via paypal
I think it's been said that it's too difficult to link a Paypal pledge to a Kickstarter pledge. There are over 42,000 backers to deal with, and rejigging pledge management systems for small edge cases is a huge hassle.
34,397 backers for star citizen on kickstarter and look how adding a post campaign pledge store worked out for them. Hint they have now over 800,000 accounts. It really is not that complicated from coding perspective.
Though in case of divinity a post campaign merchandise and pre-order store might actually work better. Keep accepting pre-orders for all those nice addon goodies from the kickstarter campaign sounds like a really good thing to keep increasing budget and make backers happy. People like to throw money at Larian and people like as well getting small goodies from Larian.
InXile also has a system set up that combines KS and Paypal pledges. If you are a KS backer they will link your rewards using your email when you sign up for their backer website. They also have an alternate email support, just in case you used a different one.
From there, you can add InXile points ($1 = 100 InXile points) via Paypal to upgrade or get more add-ons. It also works for "slacker backers". Almost all of the popular tiers are still available for BTIV and Numenera, this includes the physical CEs.
A lot of the BTIV backers were miffed because they expected to receive the bonus keys for WL2 and the like immediately after the campaign ends. But InXile wanted to get the backer site running first and was like trust us, you'll like what we are doing. And we did, more and more pledges come in everyday. A lot of people just needed more time to settle their financial accounts.