Guidance for the Streamlined Acquisition Strategy appears in the Air Force FAR Supplement AAFARS 5307.104-93. It indicates use of SASS for puchases of suppplies and services that are over the Simplified Acquisition Threshold  but less than $10M.

It also indentifies actions that do not require an acquisition plan or a SASS:   

(1) Actions that do not require an AP or a SASS:

• (a) Task/delivery orders issued in strict compliance with the terms of the basic contract except non-DoD orders > $10M;
  (b) Modifications within the scope of the contract;
  (c) Replenishment parts except for those replenishment buys that require design; development, verification testing, and approval before start of production; and,
  (d) Basic research under funding category 6.1.

It specifically mentions task orders. Discuss with your contracting officer or HCA if you still want to pursue use of a SASS. For more information see the form at :    http://www.acqnotes.com/Attachments/Streamlined%20Acquisition%20Plan%20Template.doc   for the SASS template.