When a new task has to be created, one of my first concern is "When can I do it ?" Eventually, I specify a date but I don't really know what is my workload for that day.
So I suggest :
* a mecanism that would give a warning if a threshold of X number of budgeted time (or a percentage of the day) is passed per day
* consequently, a way to spot the next free window for the budgeted task