I like to know what deck i will play, but selection of deck and game modes every time i accept challenge or create game is irritating to me.
Before "random deck" feature, i was able just to place exclamation sign in front of deck name, so it will be first in list, like this:
1) !Towerburn
2) Beasts
3) Firemage
After "random deck" feature introduced i was forced to remove one card from every deck except one, so only one left playable and be selected by randomizer.
I think it will be much more comfortable for everyone to have something like "default deck" flag. Flagged deck will be first in list. If not set, randomizer will remain. Same thing about game modes - i wish my selected game modes will be flagged by default every time i challenge someone or create game.