Hey Jc!
You can start OpenLP v2 in debug mode by entering this in your command line:
(on windows:)
"C:\Program Files\OpenLP\OpenLP.exe" -l debug
(on linux:)
openlp -l debug
And gushie is saying that v2 will support a portable modus, which can be started in the same way as you start the debug mode.
Cheers