Commented Issue: System.Web.Mvc.Ajax and System.Web.Mvc.Html are added for WebPages project only [74]

IF your project is not a MVC but just using Razor WebPages (see Umbraco macros) these namespaces are added for nothing causing an exception when compiling.
Make them configurable
Comments: Not seeing this. These are the ones that are added in my test app: using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Text; using System.Web; using System.Web.Helpers; using System.Web.Security; using System.Web.UI; using System.Web.WebPages; using System.Web.WebPages.Html;