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Based on the Feature suggestion over there: https://forums.mirc.com/ubbthreads.php?ubb=showflat&Number=233134 this thread shall reflect the attempt to implement the functionality on the script side of the client.

Just to summarize the idea: The goal is to have an indication for people, who have set themselves as "away" (primarily in the user list of a channel but having the same functionality in the notify list or use the results for the notify list where applicable might be an idea, too) like several other IRC-clients do by writing that nick(s) italic. (instead of italic another color or similar would also do the job, of course)

The user list / address list does not provide the away-status for now, so this would need to be worked around and completely be written from scratch, it seems.
As a beginning it is suggested to use the /WHO command on a regular basis to determine the status of the user. (see paragraph "The reply" in http://www.irchelp.org/irchelp/misc/ccosmos.html#Heading513 which lists the flag H/G (Here or Gone) in the /WHO-response, indicating if the nick is set /away or not)

As noted the /WHO command would need to be used thoughtfully to not cause issues when being used on large channels. (sidenote: I personally am not completely aware of how to prevent bad consequences of usage on large channels, if responses get too big, yet)
You should only need to who the channel when you join. After that just watch the event that marks people away or returned.
There is none, only sometimes a - scripted - message.
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