2 questions:
1) Is there any way to avoid cron adding entries in syslog?
2) Is there any way to configure cron to specify where to create file cron.pid? -> is it hard coded /opt/var/run/cron.pid ?
ANSWER QUESTION 2
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As a workaround I have created a symlink in directory /opt/var called "run" pointing to my desired destination folder. E.g.
rmdir /opt/var/run
ln -s /myfolder /opt/var/run