No. BECMD is designed to accept only a certain set of switches. You would appreciate that it is not possible to specify all the parameters that is needed to create a backup job as input switches. Hence the need for a job script file.
An easier way is to create the job and put it on hold. you can then use BEMCMD with the -o1 switch to start the job. For example,
"C:\Program Files\Symantec\Backup Exec\bemcmd.exe" -o1 -j"Backup SQL Logs"