Move to adjacent timeline part across parents

[owickstrom]

Would be useful to jump between clips even if they're in different parallels or sequences.

I think this should be done using some special command or modifier (e.g. Ctrl or meta) on the HJKL and arrow keys, so that you can stay within the parent if you don't want to move across parents, and use the modifier when you want to move across. But I'm not sure about this.

Any ideas?