Local taxes and markups are not the responsibility of MikroTik, I would recommend you to complain to your government and/or your local distributors.
You can also consider ordering in other countries, but you have to enquire first if you will not pay the same taxes when the package is shipped to you.
It turns out (see other topics) that it is actually possible to sort of do this.
You can have one or more personalized settings and use them for more than one device.
To do this you must set "Advanced mode" (in the Tools menu) and then you can change the "session" setting in each device.
When two devices share the same "session" they will have the same settings in winbox.
So you start by creating some session with the correct settings and then you use that whenever you connect to a new device
instead of the <own> value that creates a new session and uses it only for that device.
It is not really the same as what you request, it is not a default value but rather it is shared setting values, but it saves work.