Is it possible to have a few fields inlined together in the middle of a bunch of other fields in a suitelet form? It looks like field groups are always pushed outside the normal flow of fields and I'd like it to not do that. I'm basically looking for the same functionality as the "Same row as previous" checkbox when editing an entry form.

You can try using Break Types on your Field(s)

I've tried using STARTCOL and STARTROW but those don't do exactly what I need

If layout is becoming a pain you could resort to a SPA instead. Granted that's changing gears but gives you general flexibility.

If you're trying to mimic the

Same Row as Previous

checkbox when editing forms in the UI, I think you want to use

updateLayoutType()

with a combination of

STARTROW

,

MIDROW

, and

ENDROW

.