Can I allocate jobs directly to field operators in shared accounts?

Yes!

One added benefit of shared farms is that you can directly allocate a job to a field operator in any of the shared accounts.  If you know who will be doing the job, allocating the job to one of the recipient’s field operators saves time and removes the need for the recipient to do it.

When allocating a job to a field operator, the Job Allocation screen will display the operators in your own account by default, but you can view operators from shared accounts by selecting Other Field Operators.