PPSSPP options explained

[vnctdj]

I want to ask about some ini options...what are they doing:
AutoLoadLast - I thought it would auto load the last played game but it does nothing
ConfirmOnQuit - I thought it would ask if I want to close ppsspp but it does nothing
NumWorkerThreads - ?
FramebuffersToMem - ?
KeyMapping - ?
EncryptSave - do I really need this

I think some of these options in the .ini file are disused...
And about "EncryptSave", I read somewhere (I don't remember where) that you should let it enabled in order to protect your saves from corruption