Hi,
I do not think that you could transfer a chanspy session at all, as it is not a real bridged call. Also, what you read about chanspy cycling works if you setup all those groups and tidbits in your asterisk dialplan. FOP2 does not mess with your dialplan, so those features will not be available unless you tweak your dialplan for it, setting the spygroup variable for your relevant channels (and then you will have to set the relevant g() in fop2.cfg's spy_options or whisper_options to pass the corresponding/needed/wanted chanspy modifiers when invoking a spy session).
The listen and listen and whisper are now using only the spy permission.
I have not tried, but perhaps (ab)using local channels you could add the chanspy application into a confbridge/meetme room. But most probably thing will go bonkers or act funny. Having a custom extension that will launch chanspy and then inviting that extension into a meetme via fop2, by clicking the meetme button and typing the extension. consider this:
[from-internal-custom]
exten => _556XXX,1,Answer
exten => _556XXX,n,Wait(1)
exten => _556XXX,n,ChanSpy(SIP/${EXTEN:3})
exten => _556XXX,n,Hangup
If you dial 556100 it should launch chanspy on SIP/100. Now, from fop2 invite that extension to a conference and see what happens.
Best regards,