I realise that this is only related to step four in your list, but please don't ignore the "All Users/Current User" options in Henrik's original bug description, as some of the later bug commenters seem to have done.

There are a lot of reasons why the installing person may want to specify whether the icons are placed in the All Users profile or the current users's on a multi-user machine (especially once roaming profiles and various types of terminal access come into play). Coming from a Windows background this would be needed on NT4/2000/XP (and so on) but I'd imagine that Mac and *nix would have similar requirements too, albeit with different terminology.

I mention this before the other checkboxes need working out as this may be more than a checkbox issue, and may need other underlying code. Many Windows apps that offer the "All Users"/"Current User" option actually disable the "All Users" option if they detect that the current user doesn't have sufficient rights to write to the "All Users" profile.

I went and thought about the usability of both things for a while. IMO, it should have the Quick Launch checked and the Desktop unchecked by default.

Desktop icons have a bunch of things wrong:
* They get covered up often, meaning you have to unmaximise and/or move windows to get to them
* When you have more than one row of them this gets more of a problem, since you have to clear space in the middle of the screen instead of just one edge
* The desktop cleanup program in XP messes around with them and changes their order every so often if it's enabled

The QL icons are smaller, but at the same time they're clickable from the bottom row of pixels on the screen so they're an easier target.

OK, I think I'm rambling so I'll stop now :)

I would suggest adding a shortcut to both the desktop and the Quick Launch by default. Thinking about end users it's easier to discover the Firefox icon in the desktop rather than the Start\programs menu. I am not sure about this but I think by default the quicklaunch toolbar is not displayed in WinXP so adding it only to it will be no help. And if you have the quicklaunch toolbar enabled you have the "Show desktop" button on hand too.

I am pretty sure I will be unchecking both on each install though.

Re: What Ant said

Isn't the quick launch bar disabled by default on XP?

Personally I think bug (https://bugzilla.mozilla.org/show_bug.cgi?id=264889) should be fixed. Then because that shortcut exposes much of the functionality don't bother with a program group and just have a single shortcut to the program in start menu.

(From Alex: Uh, what does this have to do with SeaMonkey?)

I personally dislike when installers shove icons in the Quick Launch bar against my will. I have very few icons in there, and want it to stay the very same size...and not get the miserable chevrons appearing. I have a handful of icons on my desktop - these are things I run once at the start of the day, and don't reopen. Firefox and Thunderbird are two of those icons.

Aswell as the Quick Launch bar being disabled by default on XP, less techy users don't know how to increase it's size to display any icons that are added to it. So all they'll get it the little double arrow.