Since there is only one blog for a site and the blog can only be added to one page, features of the Custom Feed are very important. One that would be very helpful is to have a category menu for the custom feed, like that on the main blog. If the feed includes more than one category, then the menu would function like on the main blog--it would list the categories included in the feed AND provide the search function for those blog categories.
Alternatively, enable placement of the full blog component on more than one page and enable customization of the categories that are included in the menu.
This functionality would enable a site to tailor pages and blog content for subsets of their visitors according to the categories they are primarily interested in. (This is related to the request for subcategories--but enabling grouping of categories onto separate blog pages would mostly eliminate the need for subcategories because categories effectively become subcategories of the group. ) This alternative also would need the search function to restrict its scope to the categories selected for the particular instance of the blog.
As a general comment, I am unclear about wishlist items and when they may be possible through Corvid code. If functionality not yet standard in Wix can be accomplished with Corvid code, it would be very helpful to have that pointed out so site owners can pursue that alternative.