Problem (1) is a keyboard problem, not a GrapheneOS problem. Graphene comes with the stock AOSP keyboard which is very basic, but you can absolutely replace it. Personally I'm using the FUTO Keyboard and it does have that feature, as well as swiping, speech to text and much more.
Maybe you can try installing another SMS app for problem (2)? Much like the stock keyboard, the stock Messaging app is just the AOSP app. Honestly it works fine for me so I don't have a recommendation.
Maybe you can try installing another SMS app for problem (2)? Much like the stock keyboard, the stock Messaging app is just the AOSP app. Honestly it works fine for me so I don't have a recommendation.