I
Set the start of the range (in point)also⌃Control I While editing a text field.
O
Set the end of the range (out point)also⌃Control O While editing a text field.
⌥Option X
Clear the range selection
X
Select the whole clip under the playhead as a range
⌘Command A
Select every clip
⇧Shift ⌘Command A
Deselect everything
C
Select the clip under the pointerWhere the pointer is, not the playhead.
⌘Command ↑Up arrow
Select the clip above the current one
⌘Command ↓Down arrow
Select the clip below the current one
⌘Command →Right arrow
Select the next clip and move the playhead to it
⌘Command ←Left arrow
Select the previous clip and move the playhead to it