From data acquisition POV, contrary to shutter exposure time, lamp exposure time are pure float.
I could easily turn that into a list of floats if it makes your life easier ie:

iic expose arc neon=1,2,3,4,5,10,20,60 

What do you think ? It's up to you.

1. I am a bit confused, you mention floats, but I see that the number in the command are integers?

2. ``Problem'' is that we need to take many more exposures with 1 second, than with e.g., 60 seconds - I assume that the command you suggested does one exposure per each proposed time?

Data acquisition started

Sorry, I completely missed your answer.
I mean a single float rather than a list of floats.
Right, you could use the existing duplicate argument, but it would be constant and not function of exposure time.
But we could have done something smarter, it's just python after all.

We might need to that still. I am taking a first pass at the data, and after short analysis and discussion with JEG I am almost certain that further data will be needed (i.e., I often discover further nuances after the first attempt has been made).

The dataset is argon and neon data, with visitIds from 40260 to 41339.

I quickly created an example by stacking images with different exposure times. As we can see, the differences due to movement are dominant.