Webhook Action in Automations would be my top request for automations. I can handle scripting, but I often just want the more quickly understandable layout of a GUI around webhooks (both during setup and reviewing later).
Other top automation wishlist items for me include Ask user input for rules, Automatically linking with formulas, and Enable file field to be a "where" filter in the action trigger of automations (maybe more feasible after file field changes are complete)
My one feature request to rule them all is More Flexible Date FIeld. Without it, task management is just so much more cumbersome.