No name, no version, no git. The only sensible thing is to remove this tag completely if that bothers people.
For url please advice the tag (url=osm.wiki/Maa-amet#Import ?)

That's correct. I'm using my own scripts.

Please do NOT use Maxar in Estonia! It's really poor, wrong, outdated, and with enormous offset here! See example of what you did: http://svimik.com/osm_way_831159823.png
If you decide to map in Estonia, please use Esri or Maa-amet imagery. Thanks!

The last time I checked, the gate and booth were demolished, and there were some kind of works. I do not own precise information of the current state of that place to make any further edits. It may or may not have an entrance at this moment, as well as it could get a new entrance at a different point. You may go and check yourself if you're that enthusiastic, I can only contribute as much as I know.

I understand your concerns, but it's not really feasible with automatic edits (at least for now, until I teach my bot to work with address nodes too). Also, the placement of the nodes is a huge question too. I'm afraid that looking at the nodes people may start thinking that different parts of the building have different addresses, so I don't really agree with placing the nodes arbitrary because it will give a wrong idea. I would prefer some solution that would make it clear that all addresses belong to the whole building, not some parts of it.

Thanks for your watchfulness! I have checked this building, it indeed officially has these addresses:

http://svimik.com/maamet_ETAK_7781200.png

If you have more questions, don't hesitate to leave a comment, I will check it.