Keyboard shortcuts do not work in every case.

[snoesberger]

Some keyboard shortcuts do not work or do not always work. The following shortcuts don't work on my MacBook Pro (tested in Firefox, Chrome and Safari):

• Timeline "Move faster": "Shift + Option + i" or "Up"
• Timeline "Move slower": "Shift + Option + k" or "Down"
• Cutting "Zoom in": "Shift + Option + z" (instead I can zoom in with "Shift + Option + y", sometimes....)

These shortcuts sometimes work:

• Cutting "Zoom in": "+"
• Cutting "Zoom out": "Shift + Option + t" or "-"

On Windows the behaviour seems to be different. See also the following discussion: #1033 (comment)