Yeah, other models would be really cool. But what bothers me is the actual designs of the helmet. Most look really silly if you compare them to real life drivers. Even the designs look silly compared to what racing drivers generally wear. The addition of sponsors and logo in MyTeam has been an improvement, but then the negative aspect of that is that they have the same colors as they have on the livery, which might look really ugly on your helmet design/color scheme.
Also, they got rid of some of the better models (IMO) they had in previous games such as 'Slashes', 'Racing Line', 'Chicane' and 'Wild Thing' (my fav). A few of the special additions are an improvement, but in general I find the helmets to be severly lacking compared to a lot of other features in the game. It would be cool to have personal sponsors in Career mode (same as in MyTeam) and add them to your helmet, as the helmets look very empty now compared to what you have in MyTeam. It would also be cool that when you play career mode for RB, you have a helmet design that includes the RB logo (or AlphaTauri, or Mercedes/Ferrari) logo on the helmet. Gives it a bit more of real feel.
And I like the idea of an online connection with your codemasters account, where you can design a helmet and link it in-game. Such as game-face in other games. That would be an awesome solution.