I assume this has something to do with the way how Binance deducts the trading fee. But I did not find a way to specify, that the fee shall always be deducted from a specific currency/wallet. Is there a way to avoid this pennies accumulation on Binance when selling a coin and to get the appropriate wallet 100% empty?
It has to do with the fact Binance, when you sell a coin, works with 6 digits after the decimal point, not 8.
If you want to get use of those coins the way to do it is to go, in the spot wallet, on the path/link "Convert Small Balance to BNB", which will allow you to pick which small balances get converted into BNB, which you can keep for paying for fees, or sell.