It is possible, but it isn't quite that easy.
If you look at the backend file:
administrator/components/com_hotspots/edit/tmpl/default.php
on line 121 you have this code
<select onchange="EditLinkForm(this)">
<option value="detail"<?php echo ('detail' == $this->row->autor ? ' selected="selected"' : '') ?>><?php echo JText::_('To hotspots long description (Detailpage)'); ?></option>
<option value="sobi2"<?php echo ('sobi2' == $this->row->autor ? ' selected="selected"' : '') ?>><?php echo JText::_('To sobi2 entry'); ?></option>
<option value="article"<?php echo ('article' == $this->row->autor ? ' selected="selected"' : '') ?>><?php echo JText::_('To an article page'); ?></option>
</select>
He you have to add another option and then edit the EditLinkForm function later in the file (you'll find it at the bottom).
After that you have to edit
components/com_hotspots/utils.php
You'll find this code ar around line 179
if ($autor == "sobi2") {
$mlink = JROUTE::_("index.php?option=com_sobi2&sobi2Task=sobi2Details&sobi2Id=" . $description);
} elseif ($autor == "article") {
$mlink = JROUTE::_("index.php?option=com_content&view=article&id=" . $description);
} else {
$cats = self::get_front_categories();
if(isset($cats[$row->catid])) {
$urlcat = $row->catid . ':' . JFilterOutput::stringURLSafe($cats[$row->catid]['text']);
}
$urlid = $row->id.':'.JFilterOutput::stringURLSafe($row->name);
$mlink = JRoute::_("index.php?option=com_hotspots&view=hotspot&lcatid=" . $urlcat . "&id=" . $urlid);
}
you have to add your new option there and this should be actually all.
Actually, did I say that we'll have this feature in the next version??