Simply click on either the camera or the cross-hair and move the keyframes around until the desired speed is achieved

YES! Simply click on the arrow attached to the camera rig and move, rotate and scale to your hearts content! 

Click on a camera move you want to use and hit the 'Preview' button within the Cinepack addon user interface to view in your systems default Image Viewer 

Once downloaded from Blender Market, unzip the Cinepack.ZIP and inside you will see the assets folder and another zip file called 'addon.zip'

Open Blender > edit > preferences > addons > install

Then choose the 'addon.zip' to install to Blender

After you'll see a Cinepack tab, ensure that the check box is selected. 

Under preferences you'll see 'Select Cinepack Folder' -- click the folder then choose the 'Assets' folder as the directory.

Save preferences.

That's it! You should now see Cinepack as a tab when you hit N on the right hand side.

Easy! 

Simply choose from the 10 categories in the Cinepack addon user interface, then hit IMPORT -- it's that easy.