How do I get it to allow me to place more decimals in a withdrawal, for example 5.02151212 ETH since currently it only allows me to place 4 decimal places
Unless its an asset you created, you can’t change the decimal points. In this case more than 4 decimal points is considered as a dust so its not allowed. That being said I think an additional decimal point for ETH would be a good idea considering the price now.