Would be nice! But even then wouldn't be enough, right, it's fiddly to handle the no-change case as a user unless the software does the nasty arithmetic for you (subtracting the fee). I mean you can do that calculation manually but the software has to be coded to expect it (getting change=0 after calc.ing fee-rate * tx weight, and ditching the second output), in which case, it should just automate it for you, i.e. a flag or button for "put all of my inputs minus fee into the channel"

I vaguely remember you can deselect any utxo you dont want to use for a while by 'leasing' it. Confusing, fiddly UX though