The interface you provide for changing the kernel of a droplet is incredibly annoying and error-prone.
For one thing, you should provide a separate drop-down for i686 vs x86_64 and filter the list of kernels based on the value of that drop-down, so I don't have to scan through a ton of kernels that my droplet can't actually use. Even better would be to do that filtering automatically, since I believe you already know which droplets are 32-bit and which are 64-bit when they're created.
For another, the sorting is wrong -- it's lexical rather than logical based on the version numbers in the kernel versions.
It would be great if you could improve this. Right now, I find it incredibly difficult to find the kernel I want in that messy, out-of-order dropdown.