Hi just on the SSIS point I don't think the SSIS version has to match the SQL version. so maybe a check for multiple reg keys is in order for full disclosure..

Here's the bumpf from the 70462 guide :

You can add SSIS to a computer that has no existing SQL Server 2012 installation as

long as it meets the necessary hardware and software requirements.

- You can install SSIS for SQL Server 2012 on computers that host an existing deployment

of SSIS for SQL Server 2005 or SQL Server 2008. This is the only exception to the

rule about having a single instance of SSIS on a computer.

- You can upgrade SSIS for SQL Server 2005 or SQL Server 2008 to SSIS for SQL Server

2012. You will learn more about upgrading from previous versions of SQL Server in

Chapter 4, “Migrating, Importing, and Exporting.”