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Thank you!

If you're the same person that emailed me, forgive me for replying twice:

Yes, it does! But you have to do a bit of work based on the type of curve you're doing. There's an example scene that has a simple curve script, and here's a script I wrote that when attached to an STM object, changes the Y position of letters based on the letters X position using an animation curve:

using UnityEngine;
using System.Collections;
[RequireComponent(typeof(SuperTextMesh))]
public class BookVertexMod : MonoBehaviour 
{
    [SerializeField] private SuperTextMesh stm;
    [SerializeField] private AnimationCurve curve;
    [SerializeField] private float effectStrength = 1f; //how much pull the curve will have
    [SerializeField] private float effectWidth = 2f; //how far the curve will be evaluated. (curve can be set to not loop!)
    public void Reset()
    {
        //get stm component
        stm = GetComponent<SuperTextMesh>();
    }
    void OnEnable()
    {
        stm.OnVertexMod += Curve;
    }
    void OnDisable()
    {
        stm.OnVertexMod -= Curve;
    }
    public void Curve(Vector3[] verts, Vector3[] middles, Vector3[] positions)
    {
        for(int i=0, iL=verts.Length; i<iL; i++)
        {
            //verts[i].x
            //change y position of vertex based on X position of vertex
            verts[i].y += curve.Evaluate(verts[i].x * effectWidth) * effectStrength;
            //verts[i].z
        }
    }
}

Here's a modified version of STMVertexMod.cs I wrote that includes a script to bend single-line text along a curve: https://pastebin.com/AebgEnNm

I put that code together in about an hour, so it's missing a few features, but the point is yes, this type of manipulation is possible! But to make it work *perfect* might take a bit more modification to the script I sent.