From what I understand you have said Roger, the automatic formatting
rules should solve your issues, if you have the Professional Edition.
(Tools/Options/Automating Formatting).
For the first issue, just create a new rule with the condition that a
task has a certain colour (text/background/side bar/ highlight) or
even format (font/emboldened etc) when either the creation date is
within X days, or the start date is within X days. Or you could have
apply an icon to these tasks which says "NEW", in which case in your
todo list, you'd have to add in a column to show task icons of
course.
As for your second issue, I'd recomend the following (although
everyone will have a different way of doing this). Create a category
called 'waiting for', as you have done. Then create an automatic
formatting rule that gives tasks with this category a specific format
(grey background? or bright red text? etc). (Be careful of where you
put it as these formatting rules are done in order and you don't want
it over-written by another rule.) Then go into the contexts editor and
assign a hot key (say, 'alt W') to this category. What you'll have
is that any for task that is in 'waiting for' mode, simply press 'alt
W' and the format of the task will toggle 'Waiting For' format on and
off.
By the way, there's a free programme called IcoFX which you can use to
create icons from pictures saved from the internet and just drop these
new icons into the MLO icon folder if you need additional icons - I
use it all the time.