Yes, in Tuxedo 11gR1 the default file permissions for many files are now 0600. The platform chmod command is the recommended way to change from this default.
The following KM document also contains some other file permission change details:
"Changes in File Permission in Tuxedo 11gR1 (Doc ID 1291551.1)"
I guess that, I only would like to confirm it.
Thanks and best regards