Found a post by Brundlefly that works! Not difficult:
I think I got it figured:
1. Change Edit Filter to Transients.
2. Right-click the clip, and choose Pool > Add MBT to Pool.
3. Disable Audiosnap on the clip (either in the Audiosnap Palette, or in Clip Properties of the Inspector.
4. Set snap resolution to desired split resolution (Pool Markers will follow suit).
5. Right-click the clip and choose Split Clip(s) at Audiosnap Pool.
6. Select the track to select all the slip-edited clips.
7. Right-click one of them, and choose Apply Trimming.
Step 1 is only required so that you can get to the Audiosnap context menu to Add MBT to Pool. If you have another clip with AS enabled, you can use that one instead, and go straight to step 4. on the clip you're splitting
Note that once the pool lines are showing in a project, they'll stay there and will save with the project, allowing you to create a template that already has them enabled for this purpose.