I don't really mean to hijack the thread (and I'm not sure this counts as "hijacking") but....
I'm having the same issue; using 5.3.0 (in the mysterious "cloud".... oooh... )
I know I can go back to the non-flash interface to do it. I've also tried looking through the settings and can't make it happen.
I've gone to Reports > Timesheet Detail and added "Verification Status" and "Verified Date" to the Display Columns. The columns show up on the "View" report but no line indicating verification status shows on the .pdf when selecting "Print Timesheet" (neither "Detailed" nor "Summary".) (The line I'm expecting begins with "Timesheet electronically verified by...." and gives a date and time.)
The Print Timesheet function is not customizable. However, "Timesheet electronically verified..." does appear near the top right of the document in the same row as the pay period when its verified.
)