Hello.
Is there any way to combine the assignment of a module between joomla default and your plugin ?
Now I see this way:
1)Create in your template(templates\
your_template\index.php) 2 module positions , example ,
expleft1 and
expleft2 , and write code for check count for this positions , example
<?php if ($this->countModules('expleft1')): ?>
<jdoc:include type="modules" name="expleft1" style="xhtml" />
<?php elseif($this->countModules('expleft2')): ?>
<jdoc:include type="modules" name="expleft2" style="xhtml" />
<?php endif; ?>
2)For "assign the module only to a category view type" use EXP Module Positions Plugin and position:
expleft1
3)Diplicate this module and use standard Joomla CMS "assigned to All pages" and position:
expleft2
Then if positions
expleft1 have module , then show only this module , if no have then show positions
expleft2
Don`t tested but should work.
I try in next version create code for this in plugin.