Adding to what has been said already:
A wing stalls at a particular angle of attack, the airspeed of which depends on loading. So for example, a C150 will stall at a higher speed if the weight is increased. The angle of attack at stall should remain the same (for a given configuration).
Mil pilots are taught to be at 1.1 times stall (in landing configuration) at threshold. The problem with FlightGear <=1.9.1 (perhaps different in the new FG) is that you can't get a "g break" to determine the stall speed. Have a look at the real world data for the aircraft you're flying to try and get an idea of stall speed. Also in the real world, you'll discover "speed stability". Once trimmed at a certain speed, small throttle movements will not change airspeed but rather rate of decent (or climb). Rule of thumb fixed pitch props, every 100 RPM change will give you (roughly) that change in FPM. So having trimmed hands off level at 70 knots 2300 RPM for example, reducing RPM to 2000(-300) will give you 70 knots at -300 FPM. Not sure if FG exibits those traits though.
One last thing, if the wing is a laminar flow type with high loading, fast and thin (eg SF260 and probably most fighters?), you normally don't flare when landing, instead flying "onto" the runway (I guess like a soft carrier type landing). This is because such wings have a propensity to "let go quickly" at higher angles of attack.
eeK. (looking for a rich Russian brunette/blonde with a Su-26/31)
Eagles may soar but weasels aren't sucked into jet engines.