[eluser]Aken[/eluser]
I'm pretty surprised a SQLSRV driver hasn't been added yet, given that SQLSRV first existed over three years ago.
I built my own in early 2010 when employed full-time, so unfortunately I can't just grab and share that code. Hopefully your client will allow the code to be shared, so the unfortunate Windows-based users can have a good solution without pulling their hair out.
The info about the driver only being 32-bit is good. I never thought of that when installing it on our servers (luckily they weren't 64 bit in the first place).
The LIMIT issue can be a pain considering that even different versions of SQL Server support it in different ways. 2005 doesn't handle it well at all, and needs funky query shenanigans to try and pull a specific offset chunk. 2008 handles it a lot better, but still not anywhere near as pretty as MySQL or others.
Luckily I don't work on Windows anymore so I don't have to pull my hair out myself, but I can see how it could save other people a lot of frustration. You should definitely try and convince your client to share.