Description of feature

Hello,

This enhancement request is related to #81 .
I was wondering if a parameter might be added such as " --extra_star_align_args" that does the same as in the rnaseq pipeline from nfcore.
I often need to set several custom params for alignment and an option to do so would be nice.
Alternatively, perhaps a "--skip_alignment" param so that a user might run STAR on its own but then continue with the rest of the workflow.

If what I'm describing is already relatively straightforward, apologies, how might this use-case be accomplished?

Thanks!