request: set minimum height event-handle

[coderofsalvation]

Many times I can't change an event with value 0, because its too low for the mouse to click/drag (see picture)

[ahlstromcj]

One workaround (for now) is to use the line-draw feature of the data pane to change values. Move the mouse near the bottom of the pane and near the event. Then click and drag a line out a little and then up or down to change the level. It's a little tricky and could affect events close to that event. I will try to think of a better way to handle that.

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