1. Please limit the effects of intelligence on skill points: Does it really make narrative sense that a wizard with poor strength eventually outperforms the barbarian in terms of physical skill checks due to sheer number of skill points he has at higher levels, all the while still functioning as a completely competent mage? Because that happens.
2. To position oneself in combat or to disengage/runaway, base speeds cannot be lower than 25 feet (5 squares) and the average speed of normal humanoids cannot have more than a five foot difference. If it is common to encounter standard humanoid races whose base speed exceeds your character by 10 feet or more, compensating for the speed difference in order to run away takes the equivalent of two feats. That handicaps the character in terms of what classes he can viably play. Being limited to only four squares of movement makes flanking or positioning impractical, and tactical minded enemies can literally run circles around those characters.
While anecdotal, all my experienced players stopped playing halflings, dwarves, and gnomes after a few sessions due to combat literally slowing down or going south due to issues with movement speed. I've usually helped players by giving them boots of striding and springing if they're playing smaller races, but it really shouldn't be a requirement. Most of the enemies giving them issues with positioning and movement were just standard goblins and orcs. Think of it this way: If the encounter were against a group of goblin skirmishers who know they are fighting dwarves that are too slow to keep up with them, what are they more likely to do: engage the dwarves in melee or kite them while shooting?