Is there somewhere that I can find a list of entry points and their descriptions?

For example, what do the following do exactly:

Mod Secondary Value Weight <- Very interested in this one
Calculate Mine Explode Change
Calculate Weapon Damage <- How is this different from Mod Attack Damage?
Filter Activation
Ignore Broken Lock
Mod Favor Points
Mod Max Placeable Mines <- is this how people are increasing number of placeable runes?
Mod Player Magic Slowdown
Mod Soul Pct Captured to Weapon



Just to name a few. The wiki doesn't seem to have a section on this.

the wiki does not go into much detail about those. Your best bet would be to look through the vanilla perks for examples of how those are used. Odds are if its not used in a vanilla perk it probably doesn't work anyway/won't work as it should.
I think Mod Soul Pct Captured to Weapon is the EP used on the perk in Conjuration(or maybe enchanting?) that makes creature kills fill a little bit of your weapons enchant charge.
And I'm fairly certain that Mod Secondary Value Weight isn't used but from the name it sounds like it was meant to modify secondary spell effect magnitudes (like the .5x Stamina damage in frost spells).

I do know that Soul Stealer, the conjuration perk, has no effects. The weapons themselves that are created have enchants, and these enchants have conditions that check for the perk. But the perk itself has nothing in it.

Feel free to view my previous post as wild speculation.

if its not used in any vanilla perks and you can't find a mod that uses it successfully, I would assume its a remnant from development. Some bit that went in another direction or was cut from the game entirely.

Testing them would be the only way to get any real answers
sounds like an excellent opportunity to experiment and contribute to the wiki!...