Beacuse system testing is already going in chronological order, I came up with an idea to make this process more watchable by making it easier to understand what exactly is tested right now.
There are only 2 changes:
a) Showing above every table in system testing phase not only the percantage of testing completeness (by the way, this info also isn't shown above the table, only in contest summary), but also the time of submit for the last tested submission. This allows quickly understand, when your submit is going to be tested, if you wrote down your time of submit, obviously. Which brings me to
b) Show time of submit below the question mark during system testing as well.
In my point of view, these changes, which are not difficult to implement, will make the process of system testing more informative and exciting.
(Actually I like both ways, and I don't think current system on CF should be changed.)