Hi bb thank you for taking the time to write this ticket!
You're right, these are great ideas, and they would definitely make multi window even better. "Open in New Window" in the tab and link menus, and dragging a tab out to create a new window, are already on our backlog.
I'm a bit confused when you say Orion can't display two windows side by side though, because multi window is already supported. On iPadOS 26 you can long press the Orion icon in the Dock or on the Home Screen and tap New Window, or use Window → New Window from the menu bar. You can then place the two windows side by side.
On iPadOS 18, tap the three dots at the top of the screen and choose Split View, then pick Orion again from the Home Screen or the Dock. A second Orion window opens in the other half of the screen.
Please let me know if that helps.
Thank you for your help in making Orion a better browser!