Being a user of the onsite gen alot, I'm annoyed at the lack of features within the UI, mainly a sort of autocompletion system, or figuring out what certain tags mean or do. Well now we have that covered, my script that I developed in a few hours helps out with exactly these (simple but insanely useful and necessary):
Adds autocomplete support, so you can tab-autocomplete as needed (Also supports custom tags)
Adds a Tag Wiki Search Bar, so you can instantly look up a tag, and images for it.
Installation:
Install Tampermonkey browser extension
Go over here to install the script.
Start using it by refreshing the page and either going to the onsite generator, or pressing "t" to open up the tag wiki search bar. If a popup shows up asking for permission for requests, be sure to click "always allow domain" (It uses gelbooru's tag autocompletion api that i reverse engineered)
Oh yeah there will be custom tag support in future updates, that will allow you to make your own tags for auto-completion. For example, currently I have two custom tags, "quality", and "quality_pony", which well gets replaced with "masterpiece, best quality, amazing quality, very detailed", and "score_9, score_8_up, score_7_up, score_6_up" respectively.
Happy Generating, and I hope you find it useful, onsite junkies!