Hmmm, there isn't anything much that I could do about the fm transmitter except enabling the stereo widening.

Also It' not safe to install swappolube after using the BoostN900, you would have to remove it first with the RemoveBoostN900.sh script.

About documention regarding the.parameters file I just briefly list out what I know they each relate to:

bta2dp.parameters - bluetooth headsets (when using stereo output)

btmono-hfp.parameters - bluetooth headsets (of some type)

btmono-hsp.parameters - bluetooth headsets (of some other type)

hp.parameters - earphone (phone calls)

ihf.parameters - speakers

ihfandfmtx.parameters - fm transmitter

fmtx.parameters - fm transmitter (probably used for applications other than the default media player to access)

hs.parameters - headsets (of some type)

ihfandheadset.parameters - headsets (of some other type)

ihfandlineout.parameters - audio jacks (for some type)

lineout.parameters - audio jacks (for some other other type)

ihfandtv-out.parameters - tv out audio (for default nokia n900 tv cable)

tvout.parameters - tv out (probably for cables not manufactured by nokia)