the idea for this widget was started in the feedback thread below, but rather than hijack that thread with this project, it was easier to start a new thread in Third Party Addons.
this "Enhanced ToDo List" admin widget, expands on the default widget by showing client names (or Company Name), service details (name/domain) and domain names as mouseover tooltips (I could put them in the body, but then space might become an issue)...
for those that want to use this widget, i've attached it to this post - simply upload to /modules/widgets and the next time you go to the admin homepage, it should be there (assuming your admin role allows viewing of the ToDo List).
i've called the file "EnhancedToDo.php", so you'll end up with two ToDo widgets on your homepage, just disable the default one using the Show/Hide widgets option top right... I could have called it ToDo.php, but then the WHMCS auto-updater would have overwritten it during the next update - so it's easier to keep it separate until WHMCS improve how they handle ToDo's.
it's written for WHMCS v7.6, but will work on v7.5.x too... it might work on earlier v7 versions, but I haven't tested it on them - there is a WHMCS version check inside the widget that chooses FontAwesome 5 icons if using v7.6 or later, or FA4 if using an earlier WHMCS version.
if you spot any ToDo's that don't behave correctly (e.g a third-party addon might add a ToDo that doesn't follow the WHMCS convention), then feel free to reply about it (or PM me) - it shouldn't break the output, it will likely just not show the icon(s) for that ToDo.