I think it would be very wel with a pen to edit the waveform. Nuendo, cubase, protools have it and it's very useful to have this tool in the sequencer instead of using an other software to edit the waveform.
It would be nice, but the devs have generally dismissed that idea since they are interersted in creating a DAW that is strictly non-descructive.
I'm sure there are ways to make it non-destructive though.
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