For as long as I've been on this server, I've noticed a lack of, "improvements" to what should be helpful information on the wiki:

*Tools from Slimefun that are either no longer supported or are on the server but show no indication on whether they're available for Nations, Towny or both.
*Up to date information on what is available through Slimefun compared to the plugin's github wiki. Example being Synthetic Diamonds, as far as the plugin's page says, can act as a vanilla diamond, yet veterans of the server say otherwise.
*How to craft items related to Slimefun as not all items show their recipes or update some of the ones with recipes with pictures instead of text.
*A guide on how to use/get started with Slimefun especially with networking, cargo
*Pages like McMMO that are locked behind an unauthorized page.
*Better "How-To" guides for MoveCraft, especially for when it comes to building them.
*Pages that show the different biomes in the Nether and End dimensions along with what structures they include.
*A page on Kits as very few people know about them.
*A page on the different available commands on the server especially the ones with no /help command to them.

These are just a few I have found, but I'm sure others have found other things on the wiki that are needed to be updated or added. And while I could apply to be a contributor, I'm unsure on how tight the application process is, nor how long it would take for it to be processed.