Support for multiple clients in NIM customization command

It's highly desirable for system administrators to have a way to use NIM functionality to manage multiple systems, often on an ad-hoc basis. In particular, NIM scripts can be very useful for automating tasks across multiple AIX clients, but currently the command only allows for a single client or group as the target of the operation:

/usr/lpp/bos.sysmgt/nim/methods/m_cust -a script=ScriptName TargetMachineOrGroup

In many occasions a preconceived client group may be of use, but there are plenty of occasions where one might desire to run a script against a specific set of clients that don't fit the mold of a logically organized group - for example, to gather logs from a random set of servers experiencing issues after a network event, or to reset a user password on a subset of systems the user happened not to have touched recently and therefore their password expired. I could see this being quite useful in other scripts where a programmatically generated list of systems based on certain conditions would be useful. It seem onerous that to get this functionality we either need to craft "for" loops on the command-line, or create ad-hoc groups as needed every day. On the other hand, this seems fairly easy to build into the command itself (perhaps a new argument that accepts a list or an input file). Ideally this would also be baked into a SMIT menu for even more convenient ease-of-use.