I think I would use a Project level notepad, although I think as
mgd mentioned, without a keyboard I would use it mainly for a quick note saying what module the track was controlling.
I do this fine right now with a kind of workaround though, I make Row 00 on page 1 of the sequencer screen my "utility header row".
I mean that I put an empty pattern in Row 00 on each track and then name those patterns with the track "name". So If I go back to a project and I want to see what I was doing with each track I can scroll across the patterns in Row 00 and at the bottom of the Sequencer screen it says the pattern names which is what I used the track for.
So in the pictures attached, I have a pattern called "ERICABD" on track 1 row 00, this tells me I was controlling my Erica BD module with Track 1. The pattern in Track 2 Row 00 is called BD909 so I know Track 2 was sending out to my TipTop BD909.
8 chars pattern name is enough for me to do this. I can repeat on subsequent rows to add more notes about tracks if needed e.g. DST+ZVRB but I tend to just use the header one.
The way I explained this is a bit clumsy but the pictures should show it better