Make planar & UV align commands
Just a simple set of commands you can find in the Algomorph Category under Main UI group once you've put the scripts in your Macro folder and run them. These commands don't appear in either MainUI group / Editable Poly category or in the Editable Poly or the Edit Poly group, although they do appear as on-screen rollout buttons.
As far as the UV align X or align Y functionality goes, this doesn't explicitly exist in Max as a shortcut or button command, which is kind-of an old feature that Max was always lacking contrary to some other 3D apps...
X - works in Editable Poly base object and Edit Poly modifier as Make Planar in X, works as align to X for any selection in UVW unwrap edit dialog. Bind to any key you like, I prefer X, just make sure to clear the same key from the Edit Poly & Editable Poly binding groups (usually set to Constrain to Face - go figure).
Y - similar X, works for UV align Y and Make Planar in Y for different contexts.
Z - this one is a tad different - it is the typical Zoom Extents Selected command, so I made necessary arrangements to preserve, at least partially, the functionality if you want to still map it to the 'Z' key. If you select 1 vertex ONLY, it will zoom in on this vertex in the sub-object modes of Edit Poly / Editable Poly. If you are not in any sub-object mode or in element sub-object mode, or don't have any object selected, works as Zoom Extents Selected (~All in the latter case).
Hope that helps a bit.