It is a good point. If op has this amount then s/he may offer the loan then we may tell him/her or borrower may tell him/her to use escrow for holding collateral. But if s/he has not that amount then we do not need to go to that step. As you know people especially newbie create an account and ask for a loan then loan default on the same way will ask for collateral and will go away (collateral scam).
Asking for the address to sign or such things - I think it's their right of choice. If they don't feel comfortable then you can not push them. However you can ensure who will hold the collateral.
If you notice my last post then you will see that I know for sure that this user is not going to use an escrow for collateral.