Why is slot select not a multiselect dropdown?

**Is your feature request related to a problem? Please describe.**
If say you don't care if u get this subject from D1 or E1 slot, won't it be better to let you select both the slots in one go?

**Describe the solution you'd like**
use https://wds-shadcn-registry.netlify.app/components/multi-select/ or https://shadcn-multi-select-component.vercel.app/ to select multiple slots

**Additional context**

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