The only flights I load that will already include a SID and STAR/TRANS are those I make with the 757/767 FMS. Have a look in the the LEGS pages to see if the STAR/TRANS has the enforced speeds/altitudes in it. If not, add the START/TRANS using the onboard FMS.
When using other programs (like FSC9) to create a plan, I take note of the STAR and TRANS that I will use on arrival, but I do not save the plan with them already in it. I add them when I'm in the cockpit getting ready for a flight (preflight).

Mark