Is it possible to have this mod be configured to only apply to select surfaces? For example if i'm playing Space Exploration I only want it to apply to worlds where it makes sense to have rain.

+1 to this.

I could be wrong, I believe SE has tags to support this, would need compat code for this mod to handle it.

Hi! This is now supported in versions 1.0.1 and 0.6.3.

The Planets or surfaces with rain setting accepts a comma-separated list of exact, case-sensitive internal names. The mod checks both planet.name and surface.name. For Space Exploration, add the exact, case-sensitive surface names shown in the game to Dynamic Rain’s setting.

I decided to keep this selection manual rather than automatically enabling rain based on SE tags, since whether rain makes sense on a particular world can be subjective