This is probably not what you are after, but it's not a bad idea.
From Eli Krantzberg's X1 Groove3 video...
You can use the Pro Channel Tube Plugin with Drive turned all the way down. Then use the input and output to do gain staging. In the video, Eli used the draw tools to draw automation on the output control on the tube Pro Channel module.
By doing it this way, he could still use the track fader to adjust the overall level of the track, but could draw in time specific fader oscillations. I thought it was a nice trick. Before I noticed this, I sometimes would draw in complex fader automations and then be selecting large ranges and moving them up and down.
Alternatively to the Tube PC Module, you could use the Controls Tab of the FX Chain PC Module to adjust gain.
A nice thing about these methods is that it enables you to adjust the gain anywhere in the signal chain. You can even use the FX Chain in the FX Bin to adjust the input gain.
From my understanding, the input gain on the track itself cannot be automated. I have wanted this in the past also. I often record whole concerts at once and some songs are quieter than others. For those quiet songs, I might want to bring up the gains to keep the levels right into all the FX I'm using to mix the gig. So, in these cases, I often use the gain not to get the levels set about where I want then fine the loudest moment in the track and then normalize to -? whatever the loudest moment is. This kinda cements the gain into that track for that tune. So then as I move on down the line, I don't have to remember what gain levels I used for what tracks.