My 6.0.2 Destro Lock Macros

Warlock Archive Patch 6.0+
1

Main Rotation Macro: Press alt to cast Dark Soul: Instability & Chaos Bolt, press ctrl for Fire and Brimstone

/targetenemy [noharm][dead]
/use [mod:ctrl]Fire and Brimstone
/use [mod:alt]Dark Soul: Instability
/castsequence [mod:alt]Chaos Bolt; reset=target Immolate,Incinerate,Incinerate,Incinerate,Incinerate,Incinerate,Incinerate 
/cast Conflagrate

Shadowburn Macro: Stops your current cast and immediately cast Shadowburn
(I have this keybound to mousewheel up)

#showtooltip Shadowburn
/stopcasting
/cast Shadowburn

Havoc Macro: Casts Havoc on your mouseover target if you have any, otherwise it casts it on your target.
(I have this keybound to mousewheel down)

#showtooltip Havoc
/cast [@mouseover,harm] Havoc; [harm] Havoc
2

I tested your macro and it works great except I cannot get the fire and brimstone to work with the ctrl mod. Any help with this would be greatly appreciated.

3

Check your key bindings in game to ensure its not already being used.
Example: CTRL-1 is the default for Pet Attack, so if your macro is on the 1 key then you would need to clear this keybind to allow Fire and Brimstone to work.

Hope this Helps