At present it is very easy to use Groups to bundle together devices to act in unison based on a trigger. For example a number of bulbs, dimmer or switches can be grouped. The group can then used in a rule and all of the members of the group will react together, e.g. all the lights turn on, all the lights dim, etc.
It would be a nice feature, in my opinion, if devices operating as rule triggers could also be grouped together. For example, imagine the use case of a 3 or 4-way switch configuration in a home. Let's say that I am using Philips Dimmer Button Controllers for that purpose. I want one at each of 3 doors to the room. The 9 can lights that they each will control can be placed in a group as described above. The proposed feature would allow for the grouping of the 3 Philips Dimmer Button Controllers (controllers).
If implemented, there would be a need for only one rule to govern the interaction between the group of "controllers" and the group of "lights".
Additionally, future maintenance is enhanced as additional controllers can be added or defective ones can be removed or replaced and no rule maintenance would be required. This is one of the beautiful features of grouping as it currently exists. Unfortunately, currently it is one sided in that a light could easily be replaced in a group as the device acted upon but not a button controller as a triggering device.