Add an option to reserve funds for fees

It would be nice to make the percentage on the DEX customizable, specifically the 100%?

The same goes for “MAX” on the withdrawal.

I mistakenly used 100% on BNB and spent all leaving none to pay for fees. It would be good to have it customizable and automatically leave some reserve for fees.
I currently select 100% and then manually reduce the amount to leave some funds for fees, but sometimes I miss to correct manually.

Thanks much for such a great product.