Feature request: add support for partial open

[lencioni]

The Tailwind app allows me to configure an amount of time for a partial door open. I can then long press the garage door to partially open it by this amount. See here for example: https://youtu.be/sOODpMTewW0?t=87

It would be nice if there was a way for me to trigger a partial open via this home assistant integration.

Use case I have in mind is that I'd like to set up an automation to partially open my garage doors when the weather outside is nice so I can automatically air out my garage.

[pauln]

The local control API doesn't provide a way to use the partial open time configured via the Tailwind app, but does allow a "partial open time" to be specified (in milliseconds) when opening the door. There doesn't seem to be a core HA "cover" service call which matches the partial open behaviour (the closest would probably be set_cover_position, but trying to use that would most likely cause confusion as it's not a great fit). Do you think that a custom service call would be a reasonable way to implement this, and if so, would it make sense to include the partial open time as a parameter (so that you could have different automations which open the door to different degrees, for instance), or would you expect the time to be part of the integration's configuration/options?