This is not a simple feature to add - it requires a fundamental change to how Indigo is currently set up and would also require the ability to perform actions sequentially as requested by someone else here: (viewtopic.php?f=84&t=21196)
Indigo can currently do a hell of a lot but it can also require a hell of a lot of work and maintenance complexity. I've only been evaluating 2 months and about to get a full license this week, but I've already encountered a number of situations where CONDITION evaluated only once before one or more actions is limiting.
This suggestion is about moving the Conditions into the Actions in a revised/updated UI, such that you could build a sort of long series of actions and evaluations. In essence a simple way to create what could otherwise be created in a scripting language. Example, a sequence of "if...else if"
So...
1. The list of conditions and actions would need to run sequentially.
2. In the list you could optionally add a condition which would allow at the very least the same level of conditional logic and stacked /nested conditions we have now.
3. Then you'd be able to add one or more actions following it, optionally specifying if they (these specific actions) should run sequentially.
4. See #2 and repeat, allowing subsequent conditions to be nested with the above actions or at the top level of the list.
Preferably this would be presented in a hierarchical fashion such that the actions following a condition are grouped together, similar to for example presenting lists of items in a nested bullet-list. In an effort to make it easy to see and easy to edit what's going on.