It's the little things...
I'm a keyboard shortcut kinda guy.
If I'm using Rise and want to add a hyperlink, I select the text I want to link then just hit Command+K (which is Control+K for those Windows folks out there) followed immediately by Command+V (to paste the URL).
This works as expected when dealing with text blocks. However, if I do the same when in a list block, Command+K does nothing so when I hit Command+V I just replace the text with the URL.
It seems like a little thing, but it has caused me a lot of frustration recently as I expect basic stuff like this to work everywhere in Rise, not just in some block types.