They're some features for the ToolSwitch tweak that I'd love to see in Tweakaroo:

-Sword being Switched when attack animals.

-preference for better tools (including silk touch)

-Blocks that doesn't have any effective tool like pistons break with hand or item so you don't waste durability.

-When you Switch tool after you break the block Switch to the item that you had before.

@maruohon I was about to open a Feature Request before I found this.
The last point @nicolas-reig makes is probably extremely underrated/useful.
Say for example, you are working with rails. There you often times need to replace the rail.
Having a powered rail in hand, I want to punch out the normal rail and then place the powered rail.
Currently, Tweakeroo only gets you towards punching out the normal rail, but for placing the powered rail, I need to scroll back to the powered rail manually.
So Tweakeroo is almost there but to be even more awesome it just needs to do that last step.

@iSneaky It would certainly need to be configurable, as personally I would kind of prefer the exact opposite behaviour, at least in the "old days" before I had a good source of tools and enchantments. While mining I would silk touch any fortunable ores to save on inventory space, and use a Fortune or rather a normal pick on Iron Ore etc. to not waste durability on the "good silk touch pick". So I might just have to add a config for selecting the type of enchantment you want for a given blocks.

Would love the option to it to switch to a fortune tool that you have in your hotbar if you're breaking coal, but lets say you also have a silk touch tool too, for iron it would swap to that one.