Many thanks for your feedback!
You are referring to password protected clusters, correct? For the moment we do not recognize such models, you will receive a message telling you "Not a Grasshopper ghx file". This is due to the fact that we can't read and check the password protected part of the model. It is on our list to try and resolve this.
If your more contains scripts, we have to check the scripts manually. Automatic script checking might be added in the future. Each script needs to be checked by us only once, in case you reuse it in another model it will not need to be checked once again.
Please see above. Automatic script checking is not likely to be implemented soon.
Yes, if you make your model public you will be able to embed it:
Please use this topic to tell us which plug-ins you would like to be able to use with ShapeDiver.
Many thanks for this hint, fully agreed, we will improve this!