There is no way to enable them, options with Finesse for Direct Preview are very limited Accept or Decline that's it. Check below:
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cust_contact/contact_center/crs/express_11_0/user/guide/UCCX_BK_C02F9D7C_00_finesse-agent-and-supervisor-desktop-1101/UCCX_BK_C02F9D7C_00_cisco-finesse-agent-and-supervisor-110_chapter_011.html#UCCX_TK_A58C3BAB_00
Regards
Deepak