Scheduling sub-items flexibility

It would be great to have some flexibility on how to schedule sub-items and items.

At the moment, if I am working on project management for a project and this project management activitiy occurs every Wednesday and Thursday (as an example), I have to create multiple sub-items to reflect that in the timeline and workload. I can not multi-select specific dates in the calendar.

Another use case is, if I want to forecast 3 hours on a sub-item today and 6 hours the following day, I do not get the flexibility and have to end up creating multiple sub-items for one purpose because today, it equally spreads the estimated hours according to the timeline. This is never the reality.