One major improvement I can think of for pgAdmin is query auto completion. In the Jetbrains IDEs, the database console does smart completion using relation and column names and even completes the join based on references.
For example, to get the query below I only had to type "s * f ma ij mo" (with enters in between)
Are you aware that there is already an auto-complete feature? When you want to auto-complete something, just hit Ctrl+Space for options which will popup in a menu.
I'm predominantly a front end developer and willing to take a crack at this.
Cool - we'd be happy to take improvements. For example, there was a request a short while ago to have the auto complete menu appear automatically if configured to do so (if memory serves).