@luckman212 We don't have plans on doing temporary configuration because it raises problems for two areas:
multi-administrator/multi-controller access which is the design goal of Nexus. For example, if one admin issues a temporary configuration but another applies a stored config, then there stored config ends up ovewriting what was pushed temporarily
likelihood of split-brained configuration where the controller maintains a different state to what is on the host. This can happen already if a user does things outside of the configuration channels, such as making a pf rule change directly on the OS and not reflected in the config. Also, the Nexus controller process could restart from time to time (such as on updates), and in such cases would load from config and not know what is the authoritive on the temporary side.
The closest thing you can do for dynamic tables is to use URL Table aliases, which makes pfsense pull the list from some URL you run. We could potentially add future Nexus capability to pull from both the URL and local files, with a manual trigger to make it load on demand.