How do I change the tempo and not have it move markers?

[aasteveo]

I started working on a session that someone else brought in, and it had markers perfectly laid out, but the tempo was wrong. In this case it was doubled, which isn't really a big deal because the grid still works, just my delays are off.

When I change the tempo, my markers get messed. Nothing is in ticks, it's all audio regions in samples. How do I get around this? I basically just want to change the grid, but leave all the markers exactly where they are in relation to the audio regions.