Again, you just have IFTTT turn on a virtual switch, then have that virtual switch coming on be the trigger for any complex logic you want in SmartThings. In the V2 classic app, that could be a routine which could then change SHM armed status or mode or multiple devices, etc.
The virtual switch coming on could also trigger a webcore piston.
With the new V3 app, there are fewer choices, but you can still change location.mode, trigger multiple devices, activate a scene, etc. Anything that can subscribe to a switch turning on. 