Allow for groups to define a "default" split. i.e. roommates may split their household bills 60/40 based on who has the larger bedroom or couples may split their expenses based on relative income levels. It would be nice to save this preference and use it by default for any new expenses entered in that group. (This is something Splitwise implemented poorly. It was only available to Pro users, and then it would only appear by default for the pro user, other users in the same group would still have to enter it manually)