You can use Gmd spen control for some custom spen functions and use replace apps, but even making kitkat rom would be nonsense.
I'm currently on 4.3 with note 3 features and trust me, it's much slower than 4.1.2 (which worked like **** on note n7000). Besides the RAM usage... I have like 600-200mb of RAM free, so just forget about it.
Sent from galaxy n7105