It’s weird right?
I think the reason the step and modulation/gate information is separated is because on a modulation track, you can still enter gate information for something else.
The same is true for a track where you’d essentially wasted it on a 4x4 kick drum. you can still use the CV of that track to create an LFO or send voltage somewhere else.
On a mod track I am pretty sure you just press buttons and create gates.
If that doesn’t work, then perhaps you can either split the track into two voices (note and mod) or reverse the process and make it an ordinary track, send the modulation out the CV to wherever you’re going, and then send the Gate out to wherever you’re going.
Worst case scenario (none of that will work) you could use a second track and then route it wherever you want it to go.