It is necessary to keep the UNI_DIR_ROOT/temp folder rights to 777.
Dollar Universe submits jobs for several users, that may be in different User Group than the company owner/administrator.
Thus, it needs execute and write rights on temp to do this - for those users.
A customer may decide to restrict UNI_DIR_ROOT/temp folder rights, probably to 770, if he doesn't need a submission from a user that does not belong to the correct group.
But that won't be supported and may generate issues.