Flags are lists of properties you can check-mark, like the "flags" entry of a units in the data editor. The bit flag operators are missing from the editor, and are necessary to use your own flag presets, so I created a library of basic operations:

Variable - Modify Flags (set, clear, shift)
General - For Each Flag
General - For Each Flag by Index
General - For Each Flag Matching Conditions
General - For Each Flag Matching Conditions by Index
Conversions - Convert Preset to Integer
Index - Index of Single Flag
Logic - Flags Match Filters (any, all)
Logic - Flags And/Or
Logic - Flags Exclusive Or
Logic - Flags Not

All these but "index of bit flag" internally use a concept called macros, so there's no overhead compared to scripting it directly (the function calls are replaced with the actual operations when compiled, and the functions disappear completely). The map has an example bit flag preset variable, and functions useful to work around the editor bug with setting flag values.

Note: The import/export library functions of the editor are broken (hint and grammar text erase when you use import), so follow the method detailed in this post: Library Import/Export Bug

If you have any questions or problems, just ask in a private message.

Example map using library

Flag Operators Library