Given the many properties that are conceptually a percentage, I have split them off here as a subtask. All of these items are percentages, but are displayed as a simple number from 0-1. Using a real percentage % makes it much clearer that these are all values that represent from none to full.

Here's a list of all the properties that are conceptually percentages.

Many are currently in the range of 0.000 to 1.000. Without changing the underlying value, we could display them in the UI as 0.0 to 100.0%.

Tools

Brush:

•  brush.Strength
•  brush.auto_smooth_factor
•  brush.normal_weight
•  brush.crease_pinch_factor
•  brush.rake_factor
•  brush.tool_settings.sculpt.gravity

Properties

Render

•  render.simplify_child_particles
•  render.simplify_child_particles_render

Eevee:

•  eevee.gtao_factor
•  eevee.gtao_quality
•  eevee.bloom_knee
•  eevee.bloom_intensity
•  eevee.sss_jitter_threshold
•  eevee.ssr_quality
•  eevee.ssr_max_roughness
•  eevee.volumetric_sample_distribution
•  eevee.gi_irradiance_smoothing

Output

•  FFmpegSettings.audio_volume

View Layer:

•  pass_alpha_threshold
•  denoising_strength
•  denoising_feature_strength

Scene:

Fields Weights:

•  All are percentages

Constrains:

•  constraints[].influence

Modifiers:

•  modifiers["DataTransfer"].mix_factor
•  modifiers["Bevel"].width_pct (Percentage)
•  modifiers["VertexWeightEdit"].mask_constant
•  modifiers["VertexWeightProximity"].mask_constant
•  modifiers["Decimate"].ratio
•  modifiers["Skin"].branch_smoothing
•  modifiers["Solidify"].edge_crease_inner
•  modifiers["Solidify"].edge_crease_outer
•  modifiers["Solidify"].edge_crease_rim
•  modifiers["Hook"].strength
•  modifiers["Smooth"].factor
•  modifiers["CorrectiveSmooth"].factor

Shape Keys

•  key_blocks[].value
•  key_blocks[].slider_min
•  key_blocks[].slider_max

Cloth:

•  settings.shrink_min
•  settings.shrink_min
•  collision_settings.distance_min

Fluid:

•  modifiers["Fluidsim"].settings.partial_slip_factor

Smoke:

•  modifiers["Smoke"].flow_settings.density
•  modifiers["Smoke"].flow_settings.volume_density

Dynamic Paint

•  modifiers["Cloth"].collision_settings.distance_min

Soft Body

•  modifiers["Softbody"].settings.goal_default
•  modifiers["Softbody"].settings.goal_min
•  modifiers["Softbody"].settings.goal_max
•  modifiers["Softbody"].settings.plastic
•  modifiers["Softbody"].settings.pull
•  modifiers["Softbody"].settings.push
•  modifiers["Softbody"].settings.shear
•  modifiers["Softbody"].settings.ball_stiff
•  modifiers["Softbody"].settings.ball_damp

Rigid Body

•  rigid_body.friction
•  rigid_body.restitution
•  rigid_body.linear_damping
•  rigid_body.angular_damping

Particles:

•  lifetime_random
•  rotation_factor_random
•  phase_factor
•  drag_factor
•  damping
•  size_random
•  billboard_size
•  child_length
•  child_length_threshold
•  child_nbr
•  rendered_child_count
•  child_size_random
•  child_roundness
•  kink_amplitude_clump
•  kink_flat

Curves

•  bevel_factor_start
•  bevel_factor_end