More slash options, more modal components

Hello. I would like to see an enhancement to Slash Commands and Modals.
I find the current features not entirely convenient and suggest the following:

Modals:
- DateTime inputs
- Numeric inputs
- Attachment selectors
- Checkboxes or Switches
- Member/Channel pickers

Slash Commands:
- DateTime slash options
- A general speed improvements, if possible
- Permissions for each subcommand

All this will make the use of bots more user-friendly and remove the need for some checks in bot codes.