Board Thread:News and Events/@comment-24087318-20140907042818/@comment-24087318-20140907080835

Pending is cleared nearly each and every day, so it likely won't be too much of a problem.

(Honestly, Post, resubmit, they'll be back in time for your next post if you plan on using the changes you're resubmitting in the RP in question.)

If you're not planning on that, the RP can continue as normal. You just can't use any of the new changes till they clear.

So in short, yeah, it's perfectly okay, even if they're major changes. You just can't use them in an RP that's not on the AU board till they're Accepted.