Sometimes you want to hold a slime, but they're too slimy to hold in your hands, so there's one obvious solution: put them in a bucket. Now you can do that!
Slimes can detect the energy of chunks in which their kind have a special connection to, and will get excited whenever they're inside one. Thankfully, they're not quite slipperly enough to get out of the bucket (but I might add that at some point, configurable of course.)
Also, magma cubes can be bucketed too! Or, as I call them, hot slimes. Get yourself a bucket of hot slime. Careful though, they are hot.
Of course, this is a fairly common suggestion, and is a feature of the Quark mod. But now you can get it without all of the other useful features Quark has! What a deal!
(this is one of my first mods, so if some bugs made it into the bucket too, let me know on the GitHub issues page.)