Things FKiSS/Unix does better:

Supports "add-on" sets by specifying multiple LZH filenames
Provides an easy way to view comments, etc.
Recursive open of LZH files (archive-in-an-archive)

More "Features" from other viewers:

Ignore excess characters in FKiSS action and event names
Invert sense of ghost("cell")

In no particular order...

Better UI feedback on which page/set is currently being displayed
Remove arbitrary limits
Improve interactive response during FKiSS / catch endless loops
Handle sound("") and music("") as other viewers do
Build a real parser so that all syntax errors can be spotted reliably
Do LZH natively, and generally support it better
Editing features :)
