Hi
"A way to navigate the cursor between boundary(start/end) of the clips."
Select the clip in question on the time line and hover the mouse over it....the Start and End timeline positions and other info for the clip will be visible in a small white box. Enter the required position into the "Current position" box under the sequence preview window and.. PING!.. the cursor line will go there.
(Note: You will need to remember the value for a second or two as the reference box disappears when you select the "Current position" box)
In storyboard mode the values appear on the timebar above the frames and can be entered in the same way but without losing sight of them..
Nat