If you have the plugin installed in IE I know you can do a Ctrl+T to shown the tableviewer.
Also you can add objects , then share them with other users using F2 to open the Server Objects Pane.
You can copy and alter objects by cloning the object by left clicking + CTRL and dragging the objects.
Hope this helps.
Please find below answers to your query.
a)Is it possible to do ad hoc analysis on those dashboards (like adding filter)?
This feature is far better in Qlik Sense. There are some work around with Qlik As well.
Have a look at below link
Or there is even possibility for end user to create his/Her own reports with little efforts when compare to that Of Qlik Sense.
b)Can the data model also be published on the server along with the dashboards?
Data Model will always be published with you Qlik Application. To view the same Use IE pluggin and hit Ctrl+T to view your model.