drift to made part of the cron entry itself.

[caronc]

The drift entry should be part of the cron string itself like so:

   //     +------------------------------ second (0 - 59)
   //     |  +--------------------------- min (0 - 59)
   //     |  |  +----------------------- hour (0 - 23)
   //     |  |  |  +----------------- day of month (1 - 31)
   //     |  |  |  |  +----------- month (1 - 12)
   //     |  |  |  |  |  +----- day of week (0 - 6) (Sunday=0)
   //     |  |  |  |  |  |  +- drift time (defaults to zero)
   //     |  |  |  |  |  |  |
   //     -  -  -  -  -  -  -
   //     *  *  *  *  *  *  *

To add a shortcut '+' allowing quick (shortcut) access to the drift field, hence:
* /5 +20 would be the same as writing * /5 * * * * 20