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The next release will allow you to change the field (column) associated with a similar search to a different standard or custom column, or to a grouped search term (GST). For example, you can change "similar tags" to search a genre column instead of the standard tag column. Your case, wanting to search multiple 'authors' columns with ALT-A, is handled by creating a GST and then telling calibre to use the GST in similar authors searches.
The values to search for are taken from the specified column in the current book. If you use a GST, calibre combines the values in the current book of the fields listed in the GST. Finally, you can control for each similar search whether all values must match (an "and" search) or whether any must match (an "or" search).
Configuration is done in preferences -> searching.
FWIW, and somewhat related to your question: have you tried using Quickview? It provides an alternate way of doing similar searches and navigating through a library by opening a small floating pane that shows the book's values in a column and other books that also contain that value. Clicking on a value in the quickview pane shows the books that contain that value. Double-clicking on a book in the quickview pane changes the selection in the library view. Try it by selecting a book and typing 'q' (for quickview). If you click on a different column in the library view, the quickview pane will update to show values from that column and the books that contain that value.
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