Brony
There are sources for pointing with the Pinky although it seems that its more a Sefardy minhag than an Ashkenazi one. Ohr dot edu has a write up about it just google a bit. As for raising yourself by zimun at baruch elokeinu there are sources in a few sefarim brought down in the source section of these halachos in guidelines on Brachos by Rabbis Barclay and Jaeger. When the zimun is less than a minyan and no elokeinu I have no source for why people lift themselves and and it is possible that it has no source but maybe there is a sefer that says its good to do but I have no source.
Brony I’m with mdd. Stop attacking what we do. Get yourself a seder in halacha and start pounding halacha. You’ll learn new things every day.