People create one @ alias per team and also many others for subteams or temporary project teams, etc. There is one for oncall too. Every time one of those aliases gets tagged, I get a notification, an orange counter or sometimes messages from Slackbot asks me to join the channels.

*> punches through notification settings

I'd like to specify which aliases should not be ignored but I can't in Slack, unless I'm missing something.

Also, disabling the oragen counter is not possible (even for muted channels).