Merge Main beat and Fill

I would like to merge the main beat and fill together, in the BB Manager. So that when I press for a “fill” the fill and main beat play together. the way a percussionist and drummer would play as opposed to just a drummer. as i have customised my main kit to have just Congas instead of Toms, as i feel this is better for a solo Acoustic Guitar player
The reason for this is that sometimes when playing a fill with my made up drum and percussion Kit,
It can sound a little thin with just a guitar playing, I would not mind if this was a BB Manager song edit function, A Pedal function per song or All songs
I hope this makes sense.
Kind Regards Mr J Price