There are 4 things missing in my opinion to make it easily usable in a remote site.
Persisting coordinates. We need to be able to tell the Asiair Plus (or the app) where it is and save it so we don't have to do it each time we connect. I have heard ZWO is already working on this for the next release.
Persisting time differential. I know supporting time zones and DST could be complicated but a simple workaround would be to have a setting in the Asiair App to set a time differential. I am in eastern Canada, my Asiair is at Starfront Observatories in Texas. All i need is to be able to configure the Asiair App so it assume it is 1 hour behind my device's time so I would no longer have to change the time in my iPad/iPhone/Mac Mini/Android every time I connect and set it back when I am done.
Support for roof status. I don't know how that works in Nina but I would like to be able to "connect" the Asiair to a roof status file and have the Asiair pause a plan if the roof closes and resume if the roof reopens.
Define a default "Connect to" IP Address. The remote observatory has my Asiair connected via the ethernet port. They provide an OpenVPN and VLAN so I have a permanent IP Address for the Asiair. Every time I want to connect to the Asiair I have to select "Connecg via IP" and type in the address. I wish I could save that IP address in the app, give it a name and use it connect. Even better if the app allowed saving more than one so we could easily connect to Asiairs we have at different locations.
Last but not least. If ZWO came up with it I would buy an ASI533 MC Pro "All in one" as soon as it's released. The "All in one" would be like the new 2600MC Air but with ethernet instead of wifi. That would truly make it a remote astrophotography device.