So, I have spent my day playing with the theme editor. Love it! But what do these settings do? They don’t seem to do anything?
Gradients are directly visible, but it is a very soft gradient that you almost don’t see.
Shadows you see with the modal dialog.
Transitions are animations like the fade animation when a modal is shown.
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Further to what Patrick explained: with the first option selected, gradients will appear by default on some elements (eg buttons), but you can use them on others by adding classes, eg you could add this to a modal:
bg-gradient-primary instead of bg-primary
I think this is the most useful of the three options. Shadows can added whether or not the Shadows option is selected, by using classes. Transitions are on by default, so nothing is added to the Bootstrap css by choosing this option - but it is if you deselect the option. (At least I think this is correct.)
Now we can also finally add the gradients en shadow options on the Bootstrap 4 element inspectors - as you can now enable them in your theme.
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Thanks guys! Now that I know what I am looking for I see that those settings do indeed work.
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Check the new options and performance in 2.8.1 
Downloading now … will report in a few minutes. 
Love the new features! You guys are knocking this one out of the park.
What does this do though?
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The rocket icon also run the autoprefixer so do it at the end to be production ready and support more browsers.
During development the auto generation on change or the generation icon is just enough.
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