The ships used fusion reactors, so you just plunged into the upper layers of a nearby gas giant and skimmed off some hydrogen with a fuel scoop. Since a similar mechanism was already implemented for nebulas in Legends, so I was wondering if something similar could be (or already has been) implemented in Mercenary. Would be a better fit than skimming oxygen from their atmospheres.
Feature requests for pending games can sometimes have a way of revealing things

I don't want to give away too many potential spoilers at this stage (although this is pretty minor, others might not be), many players like to find out stuff like this on their own. For this, lets just say, give it a try
Would it be possible to have a tab-like function for entering co-ordinates.
Yup, lets go with the tab option since that would be easiest to use and key control input is disabled anyway while the entry field is open.
Also, would it be at all possible to have a two fields for entering pitch and direction manually as you can with co-ordinates?
Probably not at this point since that would require changing the nav console layout for additional entry fields. You'd really want to control your ship by entering numerical values vs flight controls? Technically, you can already control your ship's heading and pitch visually with the nav console, including the 'Set Loc' button for levelling values.
As for the additional key and button binding options for orders, deployables, and building stations, there are some solid reasons to make sure those are available also. So I will work on including those options in time for the release and with the help of the beta testers, make sure it works correctly.