GF5 is going to be much more 'user configurable' than GF4.1.
So far (about 50% of the way in) the following things are user configurable:
[ul]
[li]Font size[/li]
[li]Font type[/li]
[li]Font colour[/li]
[li]Rating font colour[/li]
[li]Background colour[/li]
[li]Table colour[/li]
[li]Alternate table colour[/li]
[li]Border colour[/li]
[li]Link colour[/li]
[li]Visited link colour[/li]
[li]Active link colour[/li]
[li]Meta Keywords[/li]
[li]Meta Descriptions[/li]
[li]Title Types[/li]
[li]Signature Separators[/li]
[li]The posts you need for each star level[/li]
[li]Whether or not to show:
[ul]
[li]Post count[/li]
[li]Moderator Level[/li]
[li]Stars[/li]
[li]Avatars[/li]
[li]Locations[/li]
[li]Seconds (on times)[/li]
[li]12 or 24 hour clocks[/li]
[li]PM Icons[/li]
[/ul]
[li]Soft editing (moderators see both the edited post and the original)[/li]
[li]Soft deleting (moderators can see the deleted post / topic)[/li]
[li]Statistical tracking[/li]
[li]In the Gallery:
[ul]
[li]Whether or not to enable picture rating[/li]
[li]The maximum image sizes (for thumbnails and full images)[/li]
[li]Whether or not to use the main image to create a thumbnail[/li]
[li]Allowing image upload to the server[/li]
[li]The level of error reporting[/li]
[li]The use of obzip (page compression)[/li]
[li]The 'from' address of emails[/li]