The Line tool has more than one option for creating MIDI CC messages, and CC data can also be created with the Draw tool. Here is a short explanation of the other Draw tool modes and their uses for creating tempo-based CC data.
Draw: Use this tool instead of the Line tool to create freehand curves; you can create pretty much any shape you want with the Draw tool. With Snap off, you can create very fine curves (Figure 10.41).