Is it possible to change the default size of the preferences popup window?
AFAIK no, but you can change any area's type to user preferences via the menu in the far left of the header:
You can then temporarily make it the size of the entire blender window by pressing
⎈ Ctrl↑ Up arrow. Toggle back to the previous screen layout with ⎈ Ctrl↑ Up arrow again.
(⎈ Ctrl↓ Down arrow works too)
If you just want to get to the prefs quickly with more screen real-estate, then perhaps this might help.
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$\begingroup$ Gandalf, Thanks for the answer. I currently enter the preferences with a button on custom pie menu i am working on. Would it be possible to get to the preferences with any of the layouts that you are showing by pressing a button on my pie menu?, thats what i am after. I will work with Blenders entire UI hidden because my pie gives me everything i need, so entering the preferences by using what you are showing is not an option because in that case i have to bring back parts of the ui only for this function,hope that makes sence. $\endgroup$ – Jimmy Livefjord Nov 22 '15 at 12:40
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$\begingroup$ @JimmyLivefjord That should be possible; you could make a custom operator in python which changes the current area to user-preferences, then point the pie-menu at that. $\endgroup$ – gandalf3♦ Nov 22 '15 at 19:47