Ahh.. sounds just like my old 3 year old gelding.
How old is your horse? If she is really young she might not have a lot of patience when standing tied. My 3 year old gelding had ALL the same issues. With the standing still while tied issue, I would tie him to our trailer, tack area, fence, or wherever & just left him there while I went to work my other horses or muck pastures. This really helped him to accept being tied & that there is no use moving around for nothing... he eventually learned to be patient & that I wont forget about him.
Now, for the whole scratching post thing, if you really don't like that, give her a nice push & back her up a couple steps. If she does it again, repeat. When my gelding did it I didn't mind too much because he wasn't doing it with an attitude or anything.. he was just being silly.
If she is one of those horses who are always crowding into you constantly, I have a good technique you can use. Go buy a long crop, training stick, dressage whip, or something that is a good extension of your arm. Fix your horse up in the halter & lead, grab your whip, & go for a long walk. During your walk, stop your horse. Say whoa & stop in your tracks. If she doesnt stop with you, add halter pressure. Next, reach your arm out with the whip & imagine drawing a huge circle around you the distance of your arm & whip together. That is YOUR bubble. Your horse should not be in that space. If she is, push her out of it. Don't use the halter, use the whip. With rhythm, smack her chest until she moves out of your bubble. If she is not responding increase the pressure of the smacks every four hits until she moves back. Keep repeating: Walk, stop, back her out of your bubble (If she is in it) & repeat. Eventually, when you stop she should stop immediatly with you & out of your personal space. Some horses take to this pretty fast.
Take your time, be patient, & consistant.