Are there any restrictions on using crimped connections to electrical devices (receptacles, switches)?
After further review, it appears that receptacles and switches are listed for use with crimp terminals. So this installation would not be a violation of NEC 110.3 (B).


  National Electrical Code 2014
  
  Chapter 1 General
  
  Article 110 Requirements for Electrical Installations
  
  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. 





  2013 UL White Book
  
  Receptacles (RTDV)
  
  Receptacles for Plugs and Attachment Plugs (RTRT)
  
  Terminals
  Terminals of a receptacle are permitted for use with certified field-installed
  crimped-on wire connectors or an assembly, if so identified by
  the manufacturer.
  
  A receptacle may also be provided with conductor leads with factory-installed
  crimped-on connectors. Such connectors may be either attached
  to the receptacle terminal or are provided with the receptacle in the smallest
  unit shipping container and are suitable for use with the terminal of
  the receptacle.
  
  Switches (WFXV)
  
  Snap Switches (WJQR)
  
  Terminals
  Terminals of a flush snap switch are permitted for use with Listed field-installed
  crimped-on wire connectors or an assembly, if so identified by
  the manufacturer.
  
  A flush snap switch may also be provided with conductor leads with
  factory-installed crimped-on connectors. Such connectors may be either
  attached to the flush snap switch terminal or are provided with the flush
  snap switch in the smallest unit shipping container and are suitable for
  use with the terminal of the flush snap switch.