Hello @thebigshort
The reason for not having Pine Editor or Strategy Tester on tv.dhan.co is not a limitation on our end but a Trading View library limitation. You can read more about it here - Dhan TradingView Console (tv.dhan.co) - Explore Trading from Charts, brought to you by TradingView. If you know Pinescript, you might want to look into Dhan TradingView Webhooks here.
Now, with the API subscription bit, you do not require any subscription to trade via our APIs. If you require data, that too is available for free if you have 25 F&O trades in last 30 days. I am sure a serious trader like you with know how of TradingView Pinescript and algos would be doing this already.