I wouldn't mind being able to roll the bombs.
Also after playing twilight princess and unlocking the ability to attach bombs to my arrows to make exploding arrows I immediately tried this out in brawl...sadly it didn't work.
The strange thing though is that you have the ability to Pull out a bomb and then pull out your bow and arrow or boomerang while still having the bomb equipped.
So what I would like to see is the ability to attach bombs onto your arrows by inputting the Bomb first and then activating the bow and arrow.
Ditch that Hurricane boomerang. (Maybe when the boomerang is used while Link is in motion it locks onto opponents Like Samus' Missiles do whenever Samus is Moving?)
And who wouldn't love to see the bug net as an alternate weapon XD. I loved using that in Soul Calibur 2!
Speaking of which Link's fully charges spin attack in SC2 would add flames to his sword, a fully charged sword spin should have more of a bonus like that.
Oh! and I believe in either melee or smash 64 if you pressed A quickly enough Link would do a rapid sword attack like captain falcons punches or fox's kicks.
It would be nice to see that make a return.