Scroll Into View - always Follow Selcted Track (Mix Window)

You could do it like this...

But careful - as this will scroll your session whenever you select a new track, which is likely not necessarily what you want.
I don't currently see a possible workaround to that.

var lastFocusedTrackName;

function main() {
    try {

        var newName = sf.ui.proTools.selectedTrackNames[0];
        if (newName === lastFocusedTrackName || newName === undefined) return;

        lastFocusedTrackName = newName;

        sf.ui.proTools.selectedTrack.trackScrollToView();
        sf.ui.proTools.selectedTrack.titleButton.mouseClickElement({
            isControl: true,
            isShift: true,
        });

    } catch (err) {
    }
}

function runForever(name, action, interval, timeout) {
    var now = (new Date).valueOf();
    if (now - globalState[name] < timeout) throw 0; //Exit if we were invoked again inside the timeout

    globalState[name] = now;
    sf.engine.runInBackground(function () {
        try {
            while (true) {
                sf.engine.checkForCancellation();
                globalState[name] = (new Date).valueOf();

                action();

                sf.wait({ intervalMs: interval, executionMode: 'Background' });
            }
        } finally {
            globalState[name] = null;
        }
    });
}

runForever("isScrollToFocusedTrackRunning", main, 500, 5000);