I'm trying to put a song I wrote on piano in LSDJ, and it has a section with five-note arpeggios.

Also, you know, in case I want to cover "Free Bird."

I'll try it how you said, ant1 and see how it goes.

Putting 5 notes in the space of 4 is quite hard, since there's 6 ticks to a rows (4 x 6 = 24 isn't divisible by 5, 4 x 6 x 2 = 48 isn't divisible by 5, 4 x 6 x 3 = 72 isn't divisible by 5, 4 x 6 x 4 = 96 isn't divisible by 5, 4 x 6 x 5 of course is, but 5 rows per semiquaver is a pretty impractical way to write a song).

Try the groove on 5+5 instead of 6+6, and then you'll have:

tick   - row one     - note 1
tick
tick
tick
tick                 - note 2  
tick   - row two
tick 
tick
tick                 - note 3
tick 
tick   - row three
tick
tick                 - note 4
tick
tick
tick   - row four
tick                 - note 5
tick
tick
tick

retrigger 4 ticks on the first row
delay 3 ticks on the second row
delay 2 ticks on the third row
delay 1 tick on the fourth row

And of course double the size of it all if you want 'bigger' quintuplets. Unfortunately groove 5+5 might make some other things (arps?) sound weird, but you'll have to live with it.

using tics or R command or what? its very possible.

are you looking to do superimposition, like a polyrhythm? or a fast 5 note roll or... idk?

This should be basic math, and I cannot figure it out. Is this even possible?