Can I use Direct Alias to remove all blog sub-categories from my URLs? Currently this... domain.com/blog/subcat/item-1 domain.com/blog/subcat/item-2 domain.com/blog/subcat/item-3 I Desire This... domain.com/blog/item-1 domain.com/blog/item-2 domain.com/blog/item-3 ...

No, it's impossible with Falang.
Besides it's only possible to share all items of same type: all categories, all articles etc.

... in your documentation about it) In my case, I have a few slave sites with own database which share some of the master site extensions such as categories, articles, easyblog and easysocial. but have separate menu and module. Each site as a special category for articles I don't want to share, ...

Pro version has all features of Direct Alias (free extension) + it can remove IDs from Joomla content articles, categories and tags URLs.

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It depends on how would you like to keep them.
If articles are shared - better share categories, otherwise categories IDs can be messed.

Would the content categories be shared, or can they be kept separately for each site????

There are 2 options:
1. Sites have same categories (all Joomla categories).
2. Each site has own independent categories as usual.

Would the content categories be shared, or can they be kept separately for each site?

Thanks for getting back to me! I guess it will be better to organize them in site-specific categories and next try to limit search by category via module settings (sure if it's possible for RokAjaxSearch - but I doubt and custom Joomla search plugin can be required). ...

... up which are likely irrelevant and confusing. If both sites has same articles - I guess it will be better to organize them in site-specific categories and next try to limit search by category via module settings (sure if it's possible for RokAjaxSearch - but I doubt and custom Joomla search ...