"Rename" option in context menu is greyed out for files owned by another user and not writable by you, even if the OS *allows* moving such files because you have write permissions on the directory in which the file is located.
ProblemType: Bug
DistroRelease: elementary OS 0.3
Package: pantheon-files 0.1.5.1+r1680+pkg35~ubuntu0.3.1 [origin: LP-PPA-elementary-os-daily]
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
CrashDB: pantheon_files
CurrentDesktop: Pantheon
Date: Sun Dec 21 05:30:12 2014
ExecutablePath: /usr/bin/pantheon-files
GsettingsChanges:
InstallationDate: Installed on 2014-12-10 (10 days ago)
InstallationMedia: elementary OS 0.3 "Freya" - Daily amd64 (20141209)
SourcePackage: pantheon-files
UpgradeStatus: No upgrade log present (probably fresh install)