Can we file the mortgage before the rescission period ends?

From the commentary to 1026.15:

3. Actions during the delay period. Section 1026.15(c) does not prevent the creditor from taking other steps during the delay, short of beginning actual performance. Unless otherwise prohibited, such as by state law, the creditor may, for example:

i. Prepare the cash advance check.

ii. Perfect the security interest.

iii. Accrue finance charges during the delay period.

Discussed several times. Bank decision.

Pro - it's filed, less of a chance of an intervening lien.

Con - in the "very" remote chance the loan is rescinded, the bank has to remove (satisfy) the lien.