To MUI or not MUI?

library JumpSystem
private struct data
    unit u = null
    real s = 0
    real ss = 0
    real height = 0
    real a = 0
    real dist = 0
    real angle = 0
    real b = 0
endstruct

globals
    private constant real RefreshRate = 0.035
    private timer T = CreateTimer()
    private data array Data
    private integer N = 0
endglobals

private function Update takes nothing returns nothing
    local integer i = 0
    loop
        set i = i+1
        exitwhen i > N
        call SetUnitX( Data[i].u, GetUnitX(Data[i].u) + Data[i].dist * Cos(Data[i].angle))
        call SetUnitY( Data[i].u, GetUnitY(Data[i].u) + Data[i].dist * Sin(Data[i].angle))
        call SetUnitFlyHeight( Data[i].u, Data[i].a*Data[i].s*Data[i].s+Data[i].height, 1000000 )
        if (Data[i].s <= 1) then
            set Data[i].b = 1.
        endif
        if (Data[i].b==0.) then
            set Data[i].s = (Data[i].s) - 1
        else
            set Data[i].s = (Data[i].s) + 1
        endif
        if ( Data[i].s > Data[i].ss) then
            call SetUnitFlyHeight(Data[i].u, GetUnitDefaultFlyHeight(Data[i].u), 500)
            call DestroyEffect( AddSpecialEffectTarget("Abilities\\Spells\\Orc\\WarStomp\\WarStompCaster.mdl", (Data[i].u), "origin") )
            set Data[i] = Data[N]
            call Data[N].destroy()
            set N = N - 1
            set i=i-1
        endif
    endloop
    if N == 0 then
        call PauseTimer(T)
    endif
endfunction

function JumpUnit takes unit u, location target, real height, real duration returns nothing
    local real dx
    local real dy
    local real s
    if  duration == 0 then
        call SetUnitPositionLoc(u, target)
    else
        set dx = GetLocationX(target)
        if dx > GetRectMaxX(bj_mapInitialPlayableArea) - 50 then
             set dx = GetRectMaxX(bj_mapInitialPlayableArea) - 50
        elseif dx < GetRectMinX(bj_mapInitialPlayableArea) + 50 then
             set dx = GetRectMinX(bj_mapInitialPlayableArea) + 50
        endif
        set dx = dx - GetUnitX(u)
        set dy = GetLocationY(target)
        if dy > GetRectMaxY(bj_mapInitialPlayableArea) - 50 then
             set dy = GetRectMaxY(bj_mapInitialPlayableArea) - 50
        elseif dy < GetRectMinY(bj_mapInitialPlayableArea) + 50 then
             set dy = GetRectMinY(bj_mapInitialPlayableArea) + 50
        endif
        set dy = dy - GetUnitY(u)
        set s = (duration/RefreshRate)/2
        call UnitAddAbility( u, 'Amrf' )
        call UnitRemoveAbility( u, 'Amrf' )
        if N == 0 then
            call TimerStart(T,RefreshRate, true, function Update)
        endif
        set N = N+1
        set Data[N].u = u
        set Data[N].b = 0
        set Data[N].s = s
        set Data[N].ss = s
        set Data[N].height = height
        set Data[N].a = -height/(s*s)
        set Data[N].dist = SquareRoot(dx * dx + dy * dy)/s/2
        set Data[N].angle = Atan2(dy,dx)
    endif
endfunction
endlibrary

        ...
        set N = N+1
        set Data[N]=data.create()
        set Data[N].u = u
        ...