Hello
It can with a CSS rule (see end of this answer)
--
about parameters customize pagination,
- we have in regards to what is displayed
- but no parameters to change the appearance of it ! ... we leave this to your Joomla template CSS
Joomla allows to extend the JPagination class,
... so
it is possible and rather easy to do so
... but we did not do it because:
1.
we would break compatibility with extensions that assume that the default 'unextended' JPagination class is used, e.g. SH404SEF pagination will break
2.
We will be interfering the pagination styling of the current Joomla template
3.
It is not really necessary:
e.g. in your case the comma can be added with a CSS rule, added by you or by your Joomla template author
Try this
a.pagenav:after { content: ","; }
or this
.pagination a.pagenav:after { content: ","; }
Regards