I'm not sure i like having no rolls for different paces Chorpa.
An example why i'm not keen on it.... If you have two characters; one has BMR 10 feet, the second has BMR 20 feet (that's a huge difference in the game. One is average, the other is lightning fast and very tall) Most of my hex-grid combats take place on an area no bigger than 50 foot square (10 hexes by 10 hexes) The problem i have is both characters can reach the other end of the map by dashing, without making any rolls. (max of 50ft for average PC, max of 100ft for lightning fast PC)
But i do like your idea of 5 ft hexes and divide by 5.
I think what i'll do is keep the rolls for rough terrain as you suggested (snow, woodlands etc)
But for open terrain i'm going to use these maneuver difficulties:
Walk (x1) ..... no roll required
Jog (x2) ...... routine
Run (x3) ...... easy
Sprint (x4) .... light
Dash (x5) ..... medium
That way it's still fairly easy, but there is a chance of failure
I have one question though, what sort of manoeuvre roll do you require? what I mean is, what skill is used for this roll?
I'm guessing it's your armour skill?