I am currently trying to manage around 100 references from ISI Web of Knowledge. To manage them in a useful way, I need to manage a table, one row for each reference, with 4-5 user defined structured columns (like: which climate variable they correlated with which demographic variable etc.).
So for this purpose I need to add custom fields to each reference; then display the table of selected references, and be able to sort and filter using these fields. Is there any reference manager that supports this? Unfortunately Zotero doesn't and is not going to.
PS: Of course I don't like the idea of having separate excel table besides. I would then miss the comfortable link between the table rows and the PDF and personal notes and other things which I manage through the reference manager (currently Zotero).