No WebDav…. The following script will set up all the neccessary roles and features for a SCCM 2012 Site Server:
# add Windows Features Required for SCCM Site Server
# add Server Manager CMDLETS
Import-Module servermanager
# add Windows Features Required for SCCM Site Server
Add-WindowsFeature WAS-Process-Model
Add-WindowsFeature WAS-Config-APIs
Add-WindowsFeature WAS-Net-Environment
Add-WindowsFeature Web-Server
Add-WindowsFeature Web-ISAPI-Ext
Add-WindowsFeature Web-ISAPI-Filter
Add-WindowsFeature Web-Net-Ext
Add-WindowsFeature Web-ASP-Net
Add-WindowsFeature Web-ASP
Add-WindowsFeature Web-Windows-Auth
Add-WindowsFeature Web-Basic-Auth
Add-WindowsFeature Web-URL-Auth
Add-WindowsFeature Web-IP-Security
Add-WindowsFeature Web-Scripting-Tools
Add-WindowsFeature Web-Mgmt-Service
Add-WindowsFeature Web-Lgcy-Scripting
Add-WindowsFeature Web-Lgcy-Mgmt-Console
Add-WindowsFeature Web-Stat-Compression
Add-WindowsFeature Web-Metabase
Add-WindowsFeature Web-WMI
Add-WindowsFeature Web-HTTP-Redirect
Add-WindowsFeature Web-Log-Libraries
Add-WindowsFeature Web-HTTP-Tracing
Add-WindowsFeature BITS-IIS-Ext
Add-WindowsFeature Net-Framework-Core
Add-WindowsFeature RDC
Life In The Cloud 
I can’t recall, WEBdav still needed for CM2012?
no longer required. the webdav http extensions are now built in to the cm12 product. it doesnt matter if you do install webdav, the windows components wont be used.