I discovered some software for windows that provides the ability to type Romanized Pāli easily in all applications. Here’s the link. This works on Windows 8 for me and has been said to work well on Windows 7 and XP. It’s a Microsoft Windows keyboard (it’s software) for typing with Unicode Latin-script fonts, for example DejaVu Sans. The instructions are somewhat straightforward. Download the zip file, extract it, and run setup.exe. Following that on Windows 8 you can hold the Windows Key and press spacebar to toggle into this keyboard layout and type Ctrl+Alt and the letter you wish to modify. For the small letter a with a macron it’s Ctrl+Alt+a. The full list of keyboard shortcuts is available on the site as well as handy printable charts. There are other various interesting links and tools on Frank Snow’s website here.