You can very easily add a line with all the links you want to the Welcome page.
There are two ways you can accomplish this. The easiest is to simply hand-code the extra links in the manager/media/style/MODxLight/welcome.html file after line 69 (where the linebreaks are set before the MessageInfo placeholder):
<td valign="top">
<span class="wm_button" style="border:0">[+SecurityIcon+]</span>
<span class="wm_button" style="border:0">[+WebUserIcon+]</span>
<span class="wm_button" style="border:0">[+ModulesIcon+]</span>
<span class="wm_button" style="border:0">[+ResourcesIcon+]</span>
<span class="wm_button" style="border:0">[+BackupIcon+]</span>
<br style="clear:both" /><br />
<span class="wm_button" style="border:0"><a href="../">Home</a></span>
********** more links *************
<br style="clear:both" /><br />
[+MessageInfo+]
</td>
Or, if you want to do it the hard way, you can edit the actual core welcome file.
In manager/actions/welcome.static.php around line 32 you’ll see where the existing icons/links are set up. Follow the pattern, setting placeholders as the original does, to add your own links (with or without icons).
Then, in manager/media/style/MODxLight/welcome.html you’ll see beginning with line 15, then again with line 63, where to add these new placeholders to the welcome template.