Instead of always typing "/w <name> <msg>" again just type "/r <msg>". You'll reply to the last one that whispered you.
yeah both ideas would be good
sometimes im whispering a few with someone and it takes time to write so i copy once and then paste
but if we whisper with many at same time thats worse
Oh and maybe an addition: Instead of typing the full name of a person just type a part. Example:
"/w faust yay"
If there are other people with "faust" in the name it will give an error of course.