What would be the best way to move a section up/down across tracks in PT?

Yeah, use Menu items and For Loops.

I've been slowy building out a perspective cut package but here's the tools for what you want.

function extendEditDown(repetitions) {
    for (let i = 0; i < repetitions; i++) {
        sf.ui.proTools.menuClick({
            menuPath: ["Edit", "Selection", "Extend Edit Down"],
        });
    }
}

function extendEditup(repetitions) {
    for (let i = 0; i < repetitions; i++) {
        sf.ui.proTools.menuClick({
            menuPath: ["Edit", "Selection", "Extend Edit Up"],
        });
    }
}

function removeEditTop(repetitions) {
    for (let i = 0; i < repetitions; i++) {
        sf.ui.proTools.menuClick({
            menuPath: ["Edit", "Selection", "Remove Edit from Top"],
        });
    }
}

function removeEditBottom(repetitions) {
    for (let i = 0; i < repetitions; i++) {
        sf.ui.proTools.menuClick({
            menuPath: ["Edit", "Selection", "Remove Edit from Bottom"],
        });
    }
}

function cutToClipboard() {
    sf.ui.proTools.menuClick({
        menuPath: ["Edit", "Cut"],
    });
}

function pasteCliboard(){
    sf.ui.proTools.menuClick({
        menuPath: ["Edit", "Paste"],
    });
}

function actionCounter({ name, waitTime, action }) {
    let actionCounter;

    if (!globalState.actionCounter) globalState.actionCounter = {};
    actionCounter = globalState.actionCounter;

    if (!actionCounter[name]) {
        actionCounter[name] = { i: 1 };
    } else {
        actionCounter[name].i++
        return;
    }

    sf.engine.runInBackground(() => {
        sf.wait({ intervalMs: waitTime, executionMode: "Background" });
        try {
            action(actionCounter[name].i);
        } finally {
            delete globalState.actionCounter
        }
    });
}

function clipUp(){
    //Get the original selected track count
    const originalSelectedTrackCount = sf.ui.proTools.selectedTrackCount;

    //Activate Pro Tools main window;
    sf.ui.proTools.appActivateMainWindow();
    sf.ui.proTools.mainWindow.invalidate();
    
    cutToClipboard()
    extendEditup(originalSelectedTrackCount)
    removeEditBottom(originalSelectedTrackCount)
    pasteCliboard()
}

function clipDown(){
        //Get the original selected track count
    const originalSelectedTrackCount = sf.ui.proTools.selectedTrackCount;

    //Activate Pro Tools main window;
    sf.ui.proTools.appActivateMainWindow();
    sf.ui.proTools.mainWindow.invalidate();
    cutToClipboard()
    extendEditDown(originalSelectedTrackCount)
    removeEditTop(originalSelectedTrackCount)
    pasteCliboard()

}

actionCounter({
    name: 'actionCounterInstance',
    waitTime: 250
    action: i => {
        switch (i) {
            case 1:
                clipDown()
                break;
            case 2:
                clipUp()
                break;
        }
    }
});

One click will move your clips down and 2 clicks will move your clips up. It reads the number of tracks selected and moves up and down the same number accordingly. No error checks if you don't have enough tracks above or below though, so mileage may vary.

Overall note from a novice here, I've learned in the last few months of exploring and learning from everyone here, anything you can do with Menu Click instead of Key Press (which is what we're most used to) is a more robust solution. So you can see most of the script is 'click menu item' based instead of the key commands that would normally do the same thing for us which us protools users have hardcoded into our brains.

Hope this helps,
Owen