At what aikido kyu grade is randori expected? Are there other aikido terms that is similar to jiju kumite?
In Seido karate, for example, jiju kumite is at the 4th Kyu and in Kuokushin karate, jissen kumite is at the 10th Kyu or as soon as possible.
In our dojo it's only part of more advanced exams (2 kyu and up I think), but it is practised (occasionally) from about 5 kyu.
There is also jiyuwaza.