VERY IMPORTANT FEATURE TO ADD!: playTo(); or playRange(); for scrollTo() style animation

Question

Hi,
I am honestly pretty surprised that there isn't an obvious way to do this in the code panel. Simply would like to make an onclick function that plays from a certain frame to another frame. The function would know to play forward or reverse.
This is primarily to enable making common modern scrollTo() style animation so I can click a button on a menubar and have the page scroll to the corresponding part of the page I would like to see. Using an if statement with getPosition doesn't seem to do this properly because using stop points on the timeline would make it so that, if there are more than 2 buttons, the stop points would be in the way.
So, an "if position==Label1, play forward to Label3" doesn't work properly if there is a stop point at Label 2. This is a very common and basic JQuery effect, seen in slide shows and so on. Say a slide show has 4 slides and 4 circles below it for navigation...the slides slide when the buttons are clicked.
Surprised this has seemingly been overlooked.
Thanks in advance for posting a way to do so!

Answer 1

I wrote a timeout/ interval  function where you can pass the symbol, the start time and end time and it will keep calling itself and advancing the timeline until it reaches the end time.  It's only 12 lines. 
function timerFunction(startms,  targetms, addinc, asymbol) {
      //startms is the timeline starting point, usually where it is at the beginningof all this
      //targetms is the desired timeline position
     //addinc is the milliseconds you want the settimeout to wait, I use 500
     // asymbol is the function with the timeline you want to control.  Note: it is being passed around here be reference, not copies which is good.
    //so call it like this:  timerFunction(freqsym.getPosition(), 1800, 100, freqsym)
       var ms;
      //console.log(" startms: " + startms + ", targetms: " + targetms +", addinc: " + addinc );
    if ( addinc < Math.abs(startms - targetms ) ) {
        ms = startms + addinc;
         asymbol.stop(ms);
        //500 = 1/2 second = the delay the time interval will wait:
        setTimeout( timerFunction, 500, ms, targetms, addinc, asymbol);
      } else {
          //finished
          ms = targetms;
           asymbol.stop(ms);