Storing <any type of> keys in Solo

[eozturk1]

I see that there is this function in device.c:

int8_t ctap_store_key(uint8_t index, uint8_t * key, uint16_t len);

1. Can it be used to store any type of key/data -- assuming it adheres to space limitations?
2. If this is possible, can the current MAX_KEYS value be increased? It is 1 -- which is a bit limiting.
3. How can we delete a key stored with this function? ctap_reset?
4. Lastly, any other ways to store keys? Do we need to convert various types of keys into ResidentKeys?