Just came up with my own workaround. Since I was just adding 2.0s for black, I created a Video Black source and copied it into my clipboard. Then instead of advancing my CTI forward 2.0s, I just pasted this clip. When I was done adding all of my chapters, I deleted the Video Black source, which also removes it from the timeline. I was able to create my whole master timeline without touching the mouse.
In any case, a keyboard shortcut for entering times quickly is greatly needed!
Why not hit TAB in the Program Monitor?
I can do that, but I was trying not to go to the Program monitor if I didn't have to. It's something I could've accomplish in the Timeline panel since I needed to hit F10 to add my Encore Chapter marker.
Unless I'm misunderstanding what you're asking about, you can just punch in absolute times directly in the Timeline panel using a numeric keypad, and you can move the CTI in relative time by using the "+" or "-" keys along with the time interval you want to move. So in your case, with the Timeline panel active, you'd just have to type "+2.0" and the CTI would move forward two seconds.
One thing to note is that, if you have any clips selected, they will move to the absolute or relative time you enter using an overlay edit. This can be helpful in some instances, but can be mildly annoying in others. If you just want to move the CTI, be sure to hit Ctrl+Shift+A to deselect everything or click in an empty space in the sequence.