I wouldn’t mind at all. First are you familiar with how to setup a virtual switch in SmartThings? If not take a look here: FAQ: Creating a virtual Device
Then In IFTTT create 2 new recipes, I used:
If (iOS Location enters my area) Then (SmartThings - Keith Virtual Switch = On)
If (iOS Location leaves my area) Then (SmartThings - Keith Virtual Switch = Off)
(Do the same with any cohabitors with their own IFTTT accounts.
Then in SimpleRuleBuilder.com I just made 2 rules used:
If (Keith Virtual Switch = On) Then (Mode = Home) AND (Do any actions)
If (Keith Virtual Switch = Off) AND (Cohabitors Virtual Switch = Off) Then ((Mode = Home) AND (Do any actions)
(Do the same with any cohabitors)
Hope that all makes sense let me know if you have more questions.