I deleted the MtpApp and I still can choose Media transfer mode (did not try it out tho as I don't need it anyway).
I believe the system app to manage the media transfer mode, to be com.sonyericsson.mtp 1.0
TMOSync Service - let me have a wicked guess, you have T-Mobile as provider
I think it's save to also delete this one - if you can spare the synchronisation with the T-Mobile service.
If you are unsure about system apps, simply do a backup of the files -> delete.