mac and essid issue

[0linguito]

I start from scratch:

rm /etc/config/wireless && wifi detect && reboot

On 2 computers, I start airodump, when pineapple rebooted, I can see it:

essid = pineapple5_2925 (is there a way to avoid broadcast this essid when starting with brand new config?)
bssid = wlan0 mac

wlan1 never appears although it shows beeing up through the gui and ifconfig. Wlan0 appears to be down through the gui.

vi /etc/config/wireless

I change the 'option ssid' of radio0 wifi-iface (which is wlan0) from Pineapple5_2925 to Livebox_67e5

I reboot pineapple and the new essid does appear.

so far so good, but now I want to change its mac:

ifconfig wlan0 down && macchanger -A wlan0 && ifconfig wlan0 up
at this point wlan0 does not appear anymore in airodump.

I edit /etc/config/wireless and change wlan0 'option macaddr', I reboot and this time it's pineapple5_2925 which appears again in airodump. I check /etc/config/wireless and see that a whole new config has been appended to the file with the original mac and essid.

conclusion:
1. how to avoid broadcast essid at starting?
2. why wlan1 does never appear?
3. How to change effectively the mac of a device?

thanx a bunch guys !