JDInstallDir is "C:\Program Files (x86)\Telerik\JustDecompile" by default.
However, if you want this feature to be added you can add it in our UserVoice system. That way other people would be able to vote for it, which will increase it's priority on our backlog.
Please, update regularly and stay tuned.
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items