Hello @Novakane,
Welcome to the world of those who cannot use the Aeros in its “quantized” mode. What you are talking about is not yet available.
Basically currently I use the Aeros in freeform mode which for me is quite acceptable. Some fixes that should now be released in the next coming weeks should definitely make it a pretty usable mode… as I use it standalone.
But when dealing with MIDI sync and stuff like that, currently the only possibility is exactly what you defined as a deal breaker, the quantized mode, requiring feeding the machine with tempo and time signature beforehand…
This is why I requested this 3rd mode you may be interested to read about. The concept has received a good feedback and has even been added to the backlog as per @DavidPackouz reply.
But having an idea of the release dates with them seems to be impossible mission… 
Although things are listened and good ideas often accepted, they have a big problem with release planning, and I see people complaining about that in almost every topic… Replies are always in the form “X will be implemented after Y”, but you’ll never have an idea on when “Y” will actually be implemented… I really start being tired of this.