[WaZZeR++]

try this... tell me if it worked

#include <amxmodx>
#include <amxmisc>
#include <fun>

public plugin_init() {
    register_plugin("Longjump","1.0","WaZZeR")
    register_concmd("amx_longjump","AdminLongjump",ADMIN_LEVEL_A,"<authid, nick, @team, @all or #userid>")
}

public plugin_precache()
{
    precache_model("models/w_longjump.mdl")     //longjump
    precache_model("models/w_longjumpt.mdl")    //---"---
}

public client_spawn(id)
    give_item(id,"item_longjump")
    
//credits to AssKicR
public AdminLongjump(id,level,cid) 
{ 
    if ( !cmd_access(id,level,cid,1) ) 
        return PLUGIN_HANDLED 
    
    new arg1[32]
    read_argv(1,arg1,31) 
    
    if ( equali(arg1,"@all") ) 
        { 
        new plist[32],pnum 
        get_players(plist,pnum,"a") 
        if (pnum==0) 
            { 
            console_print(id,"[AMXX] There are no clients") 
            return PLUGIN_HANDLED 
        } 
        for (new i=0; i<pnum; i++)
        {
            give_item(plist[i],"item_longjump")
        }
        
        console_print(id,"[AMXX] Gave all players longjump") 
    } 
    else if ( arg1[0]=='@' ) 
        { 
        new plist[32],pnum 
        get_players(plist,pnum,"ae",arg1[1]) 
        if ( pnum==0 ) 
            { 
            console_print(id,"[AMXX] No clients in such team") 
            return PLUGIN_HANDLED 
        } 
        for (new i=0; i<pnum; i++) 
        {
            give_item(plist[i],"item_longjump")
            
        }
        console_print(id,"[AMXX] Gave all %ss longjump",arg1[1]) 
    } 
    else 
        { 
        new pName[32] 
        new player = cmd_target(id,arg1,6) 
        if (!player) return PLUGIN_HANDLED 
        give_item(player,"item_longjump") 
        
        get_user_name(player,pName,31) 
        console_print(id,"[AMXX] Gave ^"%s^" longjump",pName) 
    } 
    
    return PLUGIN_HANDLED 
}