Climbing etiquette is a weird and wiley thing. What is acceptable in one area may not be considered acceptable in another. What is common practice in one spot, may be looked upon with horror in another. In the larger climbing world, there are millions of etiquette questions, but on a glacier there only tends to be a few.
1) What is the etiquette for passing a rope team on a glaciated climb?
It is acceptable to pass a rope team on a glacier. However, this must be done without hindering the other team's progress that you're passing. If a team has a pace and continues to hold that pace, then they have a right to the boot-pack trail no matter how fast they're moving.
If your rope team is walking in a boot-pack and needs to take a break, the polite thing to do is to step out of the trail. You should not take a break in a place that blocks others. If your team is slow and is taking a lot of standing mini-breaks (i.e. stopping for a few seconds or even a minute or so), then you should step out of the boot-pack and allow faster teams to pass in the trail without protest.
2) Who has the right to the steps that have been kicked in the slope?
There is a nice line of steps kicked into the slope going all the way up the mountain. Clearly, it is easier to use the steps that another team has put in than to create your own. As you're climbing up the mountain, you see another team descending in the steps. Their plunge-steps are completely destroying the steps as they descend. And while this may make things more difficult for your team, you didn't create the steps and as such, don't have any ownership over them.
3) What should I do with my human waste? Should I leave it on the summit for all to see with a nice pile of toilet paper? Or should I do something else with it?
You should do something else with it.
On expeditions or on big mountains, sometimes you can put your waste in a crevasse, but you should pack out your toilet paper. On smaller glaciated peaks, you should use a Wag Bag or the equivalent and pack everything out. On mountains like Mt. Baker and Mt. Rainier, all waste should always go out with you. If you are incapable of doing this, then you shouldn't be in the mountains.
If you have other etiquette questions, feel free to post them. This is such a large topic that a single Blog cannot do it justice.
--Jason D. Martin