"lost" line keys

[cadillackid]

I am trying to figure out how to make the most of the line keys on a T42G. I was thinking I could Lock my line 1 and line 2 keys in positions 1 and 2, which i can do... however it renders positions 6,7 and 11,12 completely useless after that...

I was thinking the phone would just go to an extra page of keys if I locked a line key.. yet I actually Lose those positions forever that are the corresponding key on the page 2 and 3..

is this normal? is there a way to have those line keys always stay there and not lose the other positions?

what does 'float' and 'default' do? i cannot see a difference between float and default..

-Christopher