As you note, Maemo is very responsible in this area and Mer (the community port that runs on older/other devices) takes security very seriously.
Personally I think it's irresponsible to release a package that opens up a network port and allows remote access to any account (never mind root) without offering adequate protection.
Moving on, it's interesting that the Maemo6 platform offers some very strong security features indeed - and they seem to be designed so they maintain (and permit) platform security even with a community modified kernel and applications - never mind a simple chroot jailbreak.
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