When I add a Git shortcut that uses "Ctrl", it doesn't work properly. More precisely, shortcuts defined using Ctrl use Cmd instead, and shortcuts which use both Ctrl and Cmd (like Ctrl-Cmd-K) don't work.
The preferences seem to be correct in the config file, so the issue may lie with Brackets itself.
Brackets 1.0.0-15191 (mac), Git 1.9.3 (Apple Git-50) & Brackets-Git 0.14.4