I understand the game has more pressing priorities and I am not suggesting these are important things. I think these two things should be considered at some point in the future as I don't see any downsides.
1) I think Chunin should be give a free house in the village. At the moment, the only thing chunin get is new clothing and the ability to host RP missions. I think with the addition of housing, it only makes sense that a ranked ninja in a village has a house. I'm not sure what utility is planned for housing in the future that would discourage this, but at the moment it seems like it's purely a cosmetic thing that is RP-esque. This would make sense that the Kage would grant a house to his ranked ninja. Perhaps in the form of like a ticket looking item called a "house voucher". And you can use it to walk into any cheap house and get it free. I do think it should only be for the smaller houses of course.
2) 1 or 2 person teams should be allowed for RP missions. There are numerous instances in the anime inspiring this game in which 1x1 missions and trainings occur. The potential is there very easily for unique RP opportunities that only make sense in a smaller group. If the concern is that it makes it easier to abuse RP tokens, I just have to disagree. There is no difference in abusability for RP tokens regardless of the number of genin allowed. Someone right now can go and give 3 genin RP tokens with zero effort just as easily as they can give it to 1 genin.
Perhaps the reason is it discourages making larger teams for RP missions, and that may be the case, but what is the issue with that? If you are playing with friends, you'd probably make a larger team for RP missions in either case, and if you don't have any friends it just makes it easier for you to learn and do an RP mission. There is no realistic downside.