Marker's Don't adjust position when adding/deleting frames

[EnderOnryo]

I was told I should make an issue for this so here I am. When inserting new frames or deleting them the markers stay on the frame number they were made at rather than sliding along to stay in their same spot relative to how things were modified. This is mildly annoying so an option to change how they work would be a nice inclusion.

[vadosnaprimer]

It would be ideal if it was configurable like in fceux taseditor. In some cases you need makers to follow your gameplay changes automatically (when they are used as quick indicators of current game events), but in other cases you want to adjust gameplay and rely on persistent marker positions to be sure you're doing things right (then markers become global reference frames).