I do see what SR is saying.
Once Nodes are set they take control of the slider. It is not a simple matter of moving the slider up/down when mixing, as the first Node message takes it over.

THIS is why CC11 seems like the best solution. The slider would set the overall volume (CC7) and the Nodes (CC11) would adjust inside of that setting.

Also, as it stands right now the slider does not reset to the correct position until a Node is hit; it does not 'look back' to where it is supposed to be when you start palyback at a given point in a song.
Example;
use Nodes to create a fade out at the end of a song. Play that section. The slider ends at zero.

Now put the cursor a couple measures before the fade out and hit play .. the volume slider stays down until the Next Node is hit to tell it where to go.

These are issues that need to be looked at, but support/development is where it needs to be brought up. This forum isn't going to fix any of it.
I notified development/support in my usual way. I suggest SR put it in the wishlist or send an email to support. I can't promise anything, but they do pay attention.

I do not work here, but the benefits are still awesome
Make your sound your own!