Add rule based on input number

I suspect the tool comebin to use too much memory when multiple BAM files are used as input. Can I write a rule that is based on the number of a specific input ?

No file, test, or entry point is named. Start by locating the rule schema and existing input-based rules, then determine whether a rule can use the count of a specific BAM input and verify the resulting memory behavior before documenting or implementing the outcome.

Written by the indexing model from the issue text.