Most of these are ripped from the java world, since any other feature I would want are more ORM related, which I'm not sure if they are within the scope of your project.
1. Automatic catching of any exception that is thrown while executing a handler proc (a proc that handles an HTTP request, also called "controller" in the repository pattern of Spring) and logging it and allowing that to be easily customized per exceptiont type. 2. Automatic ways to receive and validate received JSON/Form-Data. Basically while receiving I'd love it if the body that I receive is automatically converted to a specific data-type. That may already be doable to an extent through the chosen data-types, though I'm not sure if I can express that a value bust be either e.g. 1, 3 or 5. Basically enabling arbitrary validation logic that I just need to annotate the type that the body should be converted to with would be nice. Annotations here would be done via pragma I guess, so stuff like {.notBlank.} for strings, {.higherThan/lowerThan.} for numbers etc. for example could be neat. Checkout Spring Validation for more inspiration here 3. Shipping a simple way to do encryption and hashing. I tried to simplify that myself for hashing for the couple algo's I use myself in the nimword package. 4. Shipping an ORM that provides me with async and sync ways to perform queries between at least sqlite and postgres, ideally also some way to do queries to mongo and maybe even elasticsearch. In order to limit scope, ideally the ORM itself only tries to take care of simpler queries and enables me to write custom queries myself e.g. when it comes to recursive SQL, interacting with fts5 tables or the like. That ORM ideally also provides "signals", basically enables you to execute other procs/queries whenever an entry from a specific table is created/updated/deleted, should provide hooks for both before and after the actual creation. 5. Shipping a database migration tool that also enables custom migrations (see Django migrations) 6. Provide a simple way to load config values at _runtime_ from some kind of file that does not get compiled into the application. Parse that data into a nim object on startup and provide the object that holds those config values to every handler proc at runtime. Ideally that object is read-only and statically typed and the server crashes on startup if the config file is missing any config entries (and provides warning logs if there are superfluous config entries). Also, ideally those config values can also be provided with validation e.g. "X must be a string value and not be an empty string" or "X must be a string value and be at least n characters long but no longer than m characters", that kind of stuff.