Changing the line spacing for footnotes

#1

How may one edit the spacing either between two footnotes, or between two lines in one footnote independently of the rest of the document? For the former, I have found the par-fnote-sep variable in the manual, but I do not know how to implement it.

#2

In the preamble

<assign|par-fnote-sep|0.8fn>

For the interline spacing, I tried setting par-line-sep in the definition of the footnote (environment variables are set locally with a with construct) and it worked:

<assign|render-footnote*|<macro|sym|nr|body|<\float|footnote|>
  <smaller|<with|par-mode|justify|par-left|0cm|par-right|0cm|font-shape|right|dummy|<value|page-fnote-sep>|dummy|<value|page-fnote-barlen>|par-line-sep|0.5fn|<surround|<locus|<id|<hard-id|<arg|body>>>|<link|hyperlink|<id|<hard-id|<arg|body>>>|<url|<merge|#footnr-|<arg|nr>>>>|<arg|sym>><footnote-sep>|<set-binding|<merge|footnote-|<arg|nr>>|<value|the-label>|body><right-flush>|<arg|body>>>>
</float>>>

This goes in the preamble as well.

I do not know if there is an environment variable that controls interline spacing, which might be better. Maybe someone else knows. In fact in the macro I do not see where the value of par-fnote-sep affects the paragraph spacing, but it does.

If you need more details for setting up or modifying the preamble please ask.