Variable velocity thrue life is a major feature for particle. You can add this non exhaustive list for variable velocity in the mesh , ribbon and texture super tools , setting keyframable of course :

1- ''Velocity thrue life particle'' which would break down into 2 sliders ranging from 0 to 100 :
- Mass : 0 = linear velocity , 50 = 1/2 of velocity , 100 = no Velocity (Stop)

- Mass thrue life particle (Mass ratio?)
0 = Mass applied at the beginning of the particle's life
               50 = Mass applied to the half life of the particle
               100 = Mass applied at the end of the particle's life

2- Velocity inherit : 0 = no velocity heritance of the emitter
                                   100 = total velocity heritance of the emitter

3- Adding a vectorfield influence: 0 = no influence
                                                               100 = total influence
     Ability to change the vectorfield in Iclone

4- Change the existing billboard Atlas from 32 to 64 (8x8) with horizontal reading and not
     vertically. All Udk or Unity Atlas are horizontal animation reading.


5- "Vortex". Possibility of emitting particles heading towards the center of the emitter shape:
               Sphere, cylinder, circle, custom mesh. Would it be possible to add this function?

Video example that could be created with the emitter super tools with this features : https://youtu.be/-XmLZV7AcCI