Hi,
I tried both Kali and Debian stretch on my gemini, and it seriously hard to work with it currently. Is here anyone who can share a flash able image, which consistent and components working well, well is the key. I am personally saw this GUI first time in my life (used Xdebian/Xubuntu,Gnome , KDE and might couple of more, but for one time i can't even recall)...
Issues which actually make life harder is that out-of-box new image come with conflicts/incorrect dependencys. Debian has libreoffice by default, but it will fail the upgrade. on Kali it even worse, because the conflict will rise during the upgrade and you will not be able to boot the device anymore, if you can't solve it in that session, as far i remember packages which were involved are vim,vim* and kali distribution. What I could do remove from catalog and binarias, could not resolved via dpkg and apt. Furthermore if you upgrade KDE imported apps will not work properly , like ARK which will be not able to extract or create archive.
So a custom debian which support the following options would be really good:
Consistent apps and version
More useable gui like kde/gnome
Allowing f1-f12 by default to check the console messages and dbus during the boot, and if GUI fails somewhy still possible to do anything else than reflash...
Supporting all pheriphereis, I still struggling with bluetooth audio, can connect and trust but pulseaido fail and reset pulse each time (with max volume on speaker) when you want to select the bloototh device in Bluetoothctl I can see connected as audio-card...
These were the first pains i observed on my first week, I was trying out sailfish as well, but I don't think that will be enough for me at all ... Gemini should keep drivers updated, but it seems not happening in general . I also read some articles at maemo forum, and it seems that are couple people already put a good system together, what I would like to have a flashable image of one of the all working systems.