@Logseman... If I've understood you correctly...
It's hard to see how to do that given the way Themes currently work. When I wrote my own Theme recently I had to specifically define:
- the total screen area and position available to display all the recently-read items (avoiding the menu buttons).
- the screen area and position of a single recently-read item
I also had to provide different settings for when the PB360 was in Portrait or Landscape mode.
The total recently-read area then gets filled with as many items as will fit.
If the max number that would fit was 7 and you only wanted 5 then you would still be left with empty screen where the remaining 2 would have been, which doesn't seem to offer any benefits.