Like glass pane support but with a new toggle option for :

• small flowers
• bamboo
• short grass
• plant stem (like melons and pumpking)

to break many at once

exact
also when someone want to clear a place full of flowers can be tricky break one by one
or when someone need to break plant stems on age 0 (bounding box of 2x1x2) to replace with other crops

Those are generally placed onto the ground than against each other so I'm not sure how useful that would be.

I could imagine increasing the bounds for certain blocks while in creative though, since then you're usually trying to break many at once and often need to aim more than you should.