Lightroom :: Add Earlier Warning When Starting Import

When choosing an Import-preset with "Make a Second Copy To" selected and the external drive is not connected (e.g. working on location, ejected ext. drive temporarily), LR starts the copy process to primary location first. Only after copying LR notices that second copy location is offline, displays a warning dialog and won't start preview rendering until warning dialog is dismissed. But user might have left his computer to grab a coffee since rendering eats up CPU power.
 
Result, Problem:

1. Processing time is lost if user comes back to computer after intentionally taking a break only to discover that computer will be slowed down under processing load again.
2. Files have to be backed up manually. If "eject card after import is selected", user even has to re-insert card again.
 
Solution A: When Import with backup to external drive is selected, check and warn immediately if drive is not connected.
a) Import button is greyed out with a little red ! or some sort of indicator. User is asked to connect drive or skip backup this time
or
b) Warning dialog is displayed immediately after clicking Import button. Options as in a) are given. Disadvantage: user might miss warning, if sound turned off and turns away from computer immediately after clicking.
 
Solution B: Allow drive re-connect and copying later
1. Copy to primary location
2. Copy to second location, skip if drive not connected
3. Render previews
4. Display message "The following files could not be copied..." with added new feature "Please connect drive, then selct "copy now" button.I am using Lightroom 3.6 on Mac OS 10.7.2