Although it's a slightly different way to solve the problem, "Screen" is very popular and if it's not available by default it should be easy to install.
It's an app that runs inside a single window (tab) and let's you create many different sessions inside that tab.
It isn't quite what you were asking for, but it does allow some grouping and also you can "Detach" an entire group of terminal sessions at once and reconnect to them later with a single command--running apps will still be running and you can browse their output as though you had been there all the time.
It's not a great answer to your question, but it's really usable and if you are used to using it does solve your problem (just not in the exact way you asked)