Partial non-answer, with some hints for where you might find more info:
pillar.sigfig does influence the printing behaviour (see reprex below with, e.g. qseq for the first record is 16.46), but won't get you the trailing zeros you're looking for.
library(tibble)
x <- tibble::as_tibble(mtcars)
withr::with_options(
list(pillar.sigfig = 4),
print(x)
)
#> # A tibble: 32 x 11
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
#> 1 21 6 160 110 3.9 2.62 16.46 0 1 4 4
#> 2 21 6 160 110 3.9 2.875 17.02 0 1 4 4
#> 3 22.8 4 108 93 3.85 2.320 18.61 1 1 4 1
#> 4 21.4 6 258 110 3.08 3.215 19.44 1 0 3 1
#> 5 18.7 8 360 175 3.15 3.44 17.02 0 0 3 2
#> 6 18.1 6 225 105 2.76 3.46 20.22 1 0 3 1
#> 7 14.3 8 360 245 3.21 3.57 15.84 0 0 3 4
#> 8 24.4 4 146.7 62 3.69 3.19 20 1 0 4 2
#> 9 22.8 4 140.8 95 3.92 3.15 22.9 1 0 4 2
#> 10 19.2 6 167.6 123 3.92 3.44 18.3 1 0 4 4
#> # … with 22 more rows
Created on 2019-01-23 by the reprex package (v0.2.1.9000)
Adapted the example above from:
There's a pretty lengthy discussion of the trailing-zero behaviour here: