Ideas to Make Online Sequencer Better

[Liam]

better midi support, like you can hit the note harder to make it louder, use the pedal, etc.

That already exists. When you're recording midi, it captures the volume. You can also change note volume with alt+/alt- or alt+mousewheel.

Pedal support is not going to happen any time soon, but if your pedal is just for sustaining the note, the note length is already recorded.