Could you provide a custom column title and preserve the column width?

[YoushanLiu]

As shown on this page, the column width can be preserved.
https://github.com/zotero/zotero/blob/74ec6620e3e72ea95f930f63a3d131c57dcc80fa/chrome/content/zotero/xpcom/itemTreeManager.js#L102

In addition, the column title "Citation count" is too wide especially for small green. Could you add an option for user to set the column title? Thanks a lot!