ok @intrepidphotos. We can understand your concern.
You can authorise dapplr account on web with the following link -
https://hivesigner.com/oauth2/authorize?client_id=dapplr&redirect_uri=https://api.dapplr.in/callback&scope=posting
Once authorised, you can sign in using posting key in Dapplr app. Let us know if you face any issues.
That is slightly better as I only have to trust hivesigner; but there is still something wrong if I need to use the active key to authorize posting . That defeats the whole purpose of the posting key.