Seventh annual ext stay/ret - income (Non-O) at CW: three Q's

1.) "Number 3" statement, an affidavit of sorts, by a third party attesting to one's residence I guess. Can my landlord fill in the first section? "...*Have come to immigration division and want to testify*...". They cannot accompany me. Or leave it blank?

2.) TM.7, updated doc checklist here says completed in BLUE ink? Absolute requirement or can we prefill these with Adobe, and print in B&W?

3.) Is it currently acceptable to prefill the three *ancillary* documents (Number 3, STM2, Acknowledgement of Penalties)? Sign before, or in the presence of the IO?