I tried X only because it disappears when is x and y and it melts slowly and turns into BHOL
I use PROT and GRVT for layering
When you're subframing or building layered bombs/walls/alloys you have to stack hundreds or even thousands of particles, starting a new save for every stacked pixel and copying/stamping it over to your real save would be even more tedious than using the PROP tool. As you wrote, using a mod or at least a script makes stacking less of a headache.
well just clear before stacking
Yes it's harder than console but it allows you to select what particles to stack instead of stacking every particle on screen.
t h a t s h a r d e r t h a n c o n s o l e
Another method: place 5 particles maximum in a row, activate debug mode on the HUD (press H for HUD, then D for debug mode). Now hover over the first particle and note its X coordinate in the HUD. Select the PROP tool, set it to X and the number from the HUD, then click on the 5 particles. The particles will be stacked in order of their ID (the #number in the HUD) with the lowest ID on the bottom.
you can ALSO layer to make an animation (tho you need another console command but later) +1