1 - Friendly url or normal url ;
it will be more better for seo and friendly to ignore the article id and the category id from the urls .
and why not a option to enable friendly urls or not .
fiendly urls
knowledgebase/view/article-title-is-here/
normale url
knowledgebase/view/1/
2 - Search - fight bots and ddosed query
- add a time limit between every search from the same IP ( 30sec)
- the searched string must be 3 car or more ( now we can search 1 letter/sign !!! )
3 - add social share buttons
4 - add RSS feeds forlast 10 or 20 article .