You can use this one The message exceeds the maximum allowed length (64000 characters) It's a script by TryNinja that will show you the number of characters left in the post. This script will help you a lot if you're going to make a long thread.
Here's another script by the admin Cyrus Report to moderator on post history With the help of this script you can easily report a post to the moderator from the post history of a member. This script is useful to report the members who use plagiarized content or are spammers which posts things that are against the rules of the forum. Reporting those posts by openining them in new tab takes time and this scripts make the job easy.
Another great script that you can use is the script by grue Enhanced merit UI [1.1] This scripts makes it easier for you to merit the posts because with the help of this script you can merit a post without leaving the page. In default setting we'll have to move to another page in order to merit a post but with this script a pop-up opens and we can enter the number of merits we want to send to a post.
There are many such scripts that you can try and they will make things easier for you.
Thanks so much for this useful info. I'm sure that there is even so much more I can do as well, I really appreciate your elaboration and examples! Cheers.