Error reporting service: Why would you disable this? Believe it or not, Microsoft does actually use this data quite extensively in finding and fixing bugs. It only kicks in after a crash, and the data that's sent is not personally identifiable.
example: using "browser of choice" on a heavy flashplayer loaded day, flashplayer gives up, browser frezzes --> no nagging
IE Integrated windows authentication: Why disable this? It's only used when you access a Microsoft site that requires authentication, and if you have it disabled you have to download a separate tool in order to accomplish the same thing.
Honestly, although some of the things that this program does are valid performance tweaks, most of them are just paranoia that in the long run just ends up hurting you. Data from the CEIP and Error Reporting are used to determine what features are most used and what bugs are the biggest issues that need to be fixed. If, for example, all "power users" turn these features off, then Microsoft has no idea how power users are interacting with their computers (to improve upon the system) and also has no idea of what bugs they're running into.
Turn them off if you're paranoid about it, sure, but then don't complain when the bugs you run into or the features you like aren't worked on.
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very vaild arguments never though about them, on my side it's paranoia

i don't like it if a program/tool/service does something without me knowing it.
No no, I'm not starting a browser debate, just looking for information.
Does opera make any registry edits? FF, to my knowledge, doesn't.
Sorry, one more, does opera color manage profiles?
it does the same edits/new keys like FF (install path, file association, start menu shortcut) nothing more and of course you don't have to set it as default browser. but there are ways to install it as portable (without any installation, unfortunately you'll need a small tool for that) . it supports profiles but i'm not 100% sure if the portable one does, if you have more profiles the downside is that if you customized it as much as i have, you have to do the work twice
