Created separate issue from "Feedback after Gitcoin Beyond Blockchain hackathon" issue opened by Robin Thomas (https://portis.hellonext.co/features/feedback-after-gitcoin-beyond-blockchain-hackathon):

During testing my dapp, I have found cases, where I'll have to modify those values as the values set by Portis automatically, wasn't enough to mine the transaction. Just like how Metamask allows selecting gas fees like "Normal", "Fast" and so on (so that the users need not know much about gas), it would be good if Portis can allow doing the same from the UI.