hello guys + girls

after asking a few things on this forum, i was told that i should buy / check some options for the lathe :
... mr Wizard recomended the "interlocks" for better tailstock control
... hacdlux recomended the "off center turning" for Y axis turning

those options are not listed on the " Optional Specs & Accessories list" ( attached )

if i search through manuals for :
... "off center turning" : nothing
... "tail-stk.il.rls." , "chuuck il. rls." : nothing, but listed inside the "Ospmngcd.cnc"

if i look inside the "programing manual" or "special functions manual" : nothing


something is not right : it seems to me that there are hidden capabilities, that not everybody is aware of

is there a full list with all of these?
or is it something rare, like an updated_system_variable_list, hard to find ?
or the cnc's delivered to America have a better standard package ?

i don't know what to say ... kindly !