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-userdir option works when using runide.sh script, but it is not a part of script help when this is printed.
runide -h does display the options kwnown to the launcher, all other options and arguments are passed to the java main class. What you see is printed by the java main class.
Resolved for 3.4.x or earlier, no new info since then -> verified.
Resolved for 3.4.x or earlier, no new info since then -> closing.