What is the problem?
Currently, the Scale setting on the Play is a global setting.
What do you want to achieve?
The option to set Scale per track. This would be immensely useful in certain scenarios. For example, a user would like to be able to generate spontaneous melodic ideas quickly using the Play’s features but enabling global Scale filters out certain note ranges which then makes it impossible to send certain note values to a source (for example a drum machine that is expecting a chromatic range starting at C1) without turning the scale filter off.
Scale per track would also enable polytonality dynamics not currently possible with the global scale filter.
Are there any workarounds?
You can turn Scale mode off after using it in order to enter the desired notes unfiltered, but this becomes a tedious process as you have to remember to turn it on again each time you make a note value change to your tracks that are utilizing scale filtering. Alternatively, you can elect to avoid scale mode all together but this makes the randomization of values result in less pleasant sounds that require more adjustment.