Ledger Nano S + Electrum (MAC) (BIP39?)

Hey, newbie question here:

I bought a Nano S and i thought it would be quite cool not to be required to use Chrome for everything, so i saw i could use it with my Electrum wallet also.

When i go to create new/restore -> standard wallet -> use hardware device -> select: "an unnamed ledger"

it tells me

- your not in bitcoin mode. so i went into my bitcoin wallet i installed on the ledger
- tells me "read error"

can i do anything about this problem?

also another question:

if i have my 12 words could i theoretically import them into mycelium/ledger/electrum and spend and receive from all 3 apps using the same seed?

also can i use 2 different bitcoin wallet to login one for ledger chrome app and one for electrum without vanishing everything from the device by just opening the bitcoin app?

would be nice to know! thanks in advance