I wonder… Have you perhaps changed your pattern line highlighting in Song Settings?

The first helpful thing you can do here (if it’s not set already) is to set “Highlight every xx lines” to LPB, then the pattern editor will show a highlighted line on every beat based on your LPB setting. This highlighting will also apply to the automation editor, so you’ll see a highlighted grid line on every beat. That will at least give you a basic foundation to work from.
From there, dividing each beat into smaller chunks shouldn’t be too difficult. If you want triplets at 12 LPB, then you simply place an automation point (or note, or whatever) on every 4th pattern line (since 12 / 3 = 4). If you want stuff to happen in-between each triplet, well you simply place that stuff somewhere in-between the triplet points. You may have to zoom into the automation editor to increase your resolution and show the ‘sub-lines’, but this should still be pretty easy, since in most cases you will only care about placing points exactly half-way in-between the other existing points. You can ignore the fact that the automation grid is showing 1/8, 1/16, 1/32, etc., as this is simply referring to the current zoom level, not really any specific musical timings.
If you need to deal with more detailed stuff (6, 12, 24 slices, etc), then you just need to zoom in a bit further and continue this ‘divide and conquer’ type of approach. You will always simply be dividing something in half. Just lay down your main triplet points, then divide down as much as you need to, in order to achieve the extra resolution you desire.
Here’s a quick example song to show a bit of what I’m talking about. Hopefully you can get some ideas from it.
3595 dblue-triplet-automation-example.xrns
2 daze j has already mentioned one of my tools, but I have another one that I think you might find a bit more useful in this particular case: Automation from notes.
This tool will create automation points from the structure of the notes in your pattern, so if you can manage to lay out your basic foundation in the pattern editor, this tool can quickly generate some matching automation points for you, and then you can edit them a bit more to fine-tune it.