jsonAPIにメリットが無いと対応する必要性無いから、api経由だとnスレまで同時に取得出来る機能を付けるとか。
api/read?threads[]=operate/10000000/1-&threads[]=borad/1234567890/l50&...
{result:0,datas:[
{board:"operate",threadKey:10000000,threadName:"hoge",res:[
{resNo:1,name:"xxx",mail:"xxx",postDate:1234567890,id:"xxxxx",message:"xxxxx"},
{resNo:2,name:"xxx",mail:"xxx",postDate:1234567891,id:"xxxxx",message:"xxxxx"},
]},
{board:"board",threadKey:1234567890,threadName:"kage",isStop:true,res:[
{resNo:998,deleted:true},
{resNo:999,name:"xxx",mail:"xxx",postDate:1234567890,id:"xxxxx",message:"xxxxx"},
{resNo:1000,name:"xxx",mail:"xxx",postDate:1234567890,id:"xxxxx",message:"1000"},
]},
]}