[Eq4bits]

You probably don't want to mess with the php file for a custom member list it depends what you mean by 'custom'... you can do SOME customizing in AdminCP>Settings>Options>User Listing Options. You can also customize the memberslist TEMPLATE (AdminCP>Styles & Templates>Style Manager>Edit Templates>Member's List Templates>memberlist; certain customization can also be done in AdminCP>Styles & Templates>Style Manager>Edit Templates>CSS Templates>memberlist.css. It depends on what it is you want to do.

Tags in front of threads? You mean Thread Prefixes? You can do that on a forum by forum bases... go to AdminCP>Thread Prefixes>Manage Prefixes
when you create the prefix there's a text box for wrapping the prefix in html i.e.

PHP Code:

<i><color= red>Banned</color></i> 


to make it show as:
Banned in front of the thread title.

Not sure on the stats page... that might be one or several of the 'Steam' mods that are available here. Do a Search in the mod forum (for the version of vB that you are using) using the search term 'Steam'.

Hope that's of help.