Cron expressions are really powerful. What is available in HE to mimic that currently is not, and limited in many ways. Please add an alternative to use a cron expression.
Doing a simple thing as this "0 0 0 ? NOV 5#4 *", which would be equal to thanksgiving (the fourth Thursday in November) is doable, but requires a lot more than this simple and effective statement.
In RM I'd really like to see it implemented both for triggers and for actions.