default json profile + set more rows for the json profile

Hello,

firstly thanks for all your efforts. I created my own json file based on this source (https://swordfishslabs.wordpress.com/2015/02/27/json-profiles-in-ubuntu-terminal-app/).
It is so great, but I would have 2 wishes/questions:

1. The default is always the 'Control Keys' layout, instead I want it to be my custom json layout. So how can I set the default json profile that loads when the terminal is started? I can just turn the profiles on/off in the settings (and in the conf I could not find anything more either ~/.config/com.ubuntu.terminal/com.ubuntu.terminal.conf).

2. Would it be possible to set two rows for the buttons of the json layout?

3. Plus an extra wish: would it be possible to make the buttons more space-efficient? Even if the text on the buttons consist of only 1 character there is max 6 buttons in a row although more could fit there.

Thanks again,
Laszlo