For example iTunes prevents Mac going to sleep mode. Please add this important enhancement also to Cyberduck. Otherwise it's always necessary to put sleep mode from e.g. 15 minutes to never when doing large unattended uploads.

There must be a default OSX function for this, this is what happens when iTunes does something, easily identified by PID delivered by pmset, after iTunes finished it's work, prevention will go off:

iMac27RR:~ roland$ pmset -g
Active Profiles:
AC Power		-1*
Currently in use:
 hibernatemode        0
 halfdim              1
 womp                 1
 networkoversleep     0
 sleep                15 (sleep prevented by 562)
 powerbutton          1
 ttyskeepawake        1
 hibernatefile        /var/vm/sleepimage
 autorestart          0
 disksleep            10
 displaysleep         5
iMac27RR:~ roland$ ps -p 562
  PID TTY           TIME CMD
  562 ??         1:24.57 /Applications/iTunes.app/Contents/MacOS/iTunes -psn_0_434282