To a point you could control this in policykit, in /usr/share/polkit-1/actions/org.freedesktop.upower.policy and or /usr/share/polkit-1/actions/org.freedesktop.login1.policy

The relevant entries would be org.freedesktop.upower.suspend & org.freedesktop.login1.suspend respectively

In that case editing the line <allow_active>yes</allow_active> to <allow_active>no</allow_active> would work.

It's probable that in 13.10 policykit is no longer used for this so those edits would have no effect. In that case you could figure out how hibernate has been disabled & do the same for suspend or cause power management to inhibit suspend altogether.

The latter could be done as such -

sudo nano /etc/pm/sleep.d/00_cancel-suspend

copy & paste this in -

#!/bin/sh

# prevents suspend

. "$PM_FUNCTIONS"

case "${1}" in

  suspend)

    inhibit

    ;;

  resume)

    exit 0

    ;;

esac

Then on keyboard go

ctrl+o

enter

ctrl+x

to save & exit nano

Finish with -

sudo chmod 0755  /etc/pm/sleep.d/00_cancel-suspend