If you like working on the latest IDE, or if you have a paid license for the latest IDE, you likely won't want to revert to Visual Studio 2010. The argument that it's required for XP support is hardly valid, as most technology enthusiasts and industry professionals made the choice to leave that obsoleted operating system. Moreover, VS2012 can compile perfectly fine for XP, even if Leadwerks had to (for some obscure reason) use MFC.
Luckily, if Josh isn't willing to include a VS2012 build or project template, you can still use VS2012, as long as you have VS2010 installed. I haven't tested if this trick works from a paid VS2012 and an express VS2010, but it works if both are express (and is likely to as well if both are paid):
Download and install VS2010
Open up VS2012 and your Leadwerks project
If prompted to upgrade the project to VS2012, accept and go through the wizard
Right click your project > Properties...
Change "Configuration" from "Active(Debug)" to "All Configurations"
Go to the Configuration Properties > General tab
Change the "Platform Toolset" from "Visual Studio 2012 (v110)" to "Visual Studio 2010 (v100)"
Click OK to apply and close
Enjoy!