If the House Lord is not online, can another House member be promoted to Lord?

Not currently

Can the max number of players in a House be increased?

Not currently

How do I request a troop loan from a member of my House?

Tap the House button, choose a House member, select the troops you wish to borrow, and then tap "Borrow"

How do I increase my supply cap (troop limit)?

You can increase your supply cap in the following ways: 1. If playing as human, upgrade your Outpost.  If playing as Dwarf, upgra...

Are there any units that cannot be healed?

Yes, it will be indicated in the unit details if a unit cannot be healed.

Why do some players' troops exceed their troop capacity?

This is normal. Because units can be accquired from chests, its possible to exceed your troop capacity.

Is it possible to recall troops that have been garrisoned on city walls?

No.

Can Buildings and Techology be queued up to be built or researched?

These can both be queued: 1. Construction Queue: While a building is under construction, you can add another building to the queue. Wh...