Have a look at the "Attributes" feature. It exists in version 1.5.8 and probably earlier.
You can pre-define your custom attributes under Document Setup.
Then in your document, just right-click your object and click on Attributes. Then you can add your own attribute as needed. For example make one that is called "waits for OK from boss". Then maybe make it boolean and define for yourself that Value "1" is approved (already) by the boss and "0" is still waiting or refused by the boss.
I cannot tell you, where to quickly see a list of all objects with attribute "not-ready". Maybe just search throught the .sla XML file?
There is something about "Item Attribute Name" under Properties in the Table of Contents feature. Maybe you can indeed generate a "table" based on all objects that carry one of your custom tags. Need to read up, sorry.
I have a document, where I have to create many draw-out lines in a customer-pre-defined color.
So I go > Document Properties > Item Tools > Lines. And I set my Line-style, width etc. All that works fine, as normally.
BUT: I only get a very short list of Line Color options.
My question: How can I set any needed color in "Item Tools" > Lines > Line Color?
In the document under > Edit > Colors and Fills I have defined the customer's special color of choice and have given it a name. And it appears fine in all other menus, where I have to select a color. And I have chosen a large Color Set for my document. But whatever I try, under "Item Tools" the colors on offer are always this very short list.
I think I have done what you want to do for fan translation of a game. I translate text in Gdrive calc. I made a templateScribus file with placeholder text in frame box (line number of the Gcalc sheet where text is located). A python code take the text with formatting (bold, italic, color) and replace it in the template. I can autogenerate a pdf like that.