We may be talking about two different things, but the NSIS installer I wrote for my JKLmouse program installs only into the user profile. It doesn't touch Program Files [(x86]) at all, so it doesn't need elevation:

https://github.com/geary/jklmouse/blob/master/AutoHotkey/Sou...

Or were you saying that your installer runs elevated and installs to Program Files, and also wants to write some files to the user profile? I would think that should just work?

Shameless plug: JKLmouse gives you home row mouse control in nearly every Windows app. It's like MouseKeys but doesn't require a numeric keypad, so it works on laptop keyboards. Not too many people know about it; I wrote it for my own use years ago (first in C, then later in AutoHotkey). It is so nice to be able to move the mouse pointer pixel by pixel.

http://www.jklmouse.com/

You can do it with MultiUser.nsh. I've just published an installer script like that: https://github.com/dbohdan/tcl86-nsis-installer/. With the caveat that my NSIS is rusty, I wouldn't call the result horrible or even particularly ugly relative to the baseline for NSIS scripts.

I use the UAC plug-in, but it is a pain indeed :/

Are you 'the' Justin Frankel? If so, I feel vindicated in my decision :) (which was admittedly controversial among my colleagues at the time because NSIS is so much more 'natural' to use than MSI). I mean if even you find UAC a pain, then it's only normal that those of us with much less insight into the inner workings of NSIS are having a much harder time still...

yes, he's the real deal