Is it possible to add an order queue in DOM?
To my mind it is important to know the "place" of your limit order among all the limit orders at specific level.
As far as I know this feature is realised only in X_TRADER.
https://www.tradingtechnologies.com/en/help/xtrader/viewing-your-estimated-position-in-queue/ - here's the link how it is implemented in X_TRADER.
It can be done like this or your "place" in the queue can just be shown in brackets next to your limit order