Receptacles -- # of wires per screw

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"110.3 Examination, Identification, Installation, and Use of Equipment. (B) Installation and Use. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling."
Information included with the listing can only be found in the Building Materials List published by the testing laboratory. To be included with the labeling the instructions must be contained within the outlined area that contains the testing laboratory seal. An Example would be "Underwriters Laboratory Listed. Copper Conductors Only." The instructions within the package that say use only manufacturers parts are not enforceable because they are not included with the Listing. The testing laboratories list items that are recognized for use with other manufacturers equipment. Thomas & Bettes makes an extensive line of circuit breakers that have been recognized for use in other manufacturers panels. Each manufacturer specifically says use only our breakers. That is not an instruction that is included in the listing or labeling and is therefore unenforceable.
-- Tom Horne
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If you use back-feed and one wire on the screw-you can utilize 3 wires per screw. These are normally commercial or hospital grade 15 or 20Amp.
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