That makes perfect sense... with relative speed you need to get a reference to understand how fast you're moving overall, maybe a mini map could help convey that? The problem with absolute is that you need to be able to relate the new arrow you drag to your current speed... so you can go "I'll make it a bit longer so that I can catch that moon", without it's a guessing game whether you're going to speed up or slow down. A shadow vector arrow radiating from you? But frankly, most of the time you want to make relative adjustments to match the speed of other objects. In which case I think it's Ok if the "max speed" only applies to your own actions as long as it's way above what anything else moved at. And maybe apply some sort of aether drag to lower to the max speed if you ever go over? In the relative case you only need to know the absolute speed because of the risk of hurtling into celestial bodies at a million miles per hour... rather than for each speed adjustment you make... so it can be punted of to the side of the screen. Sorry for rambling, this was an interesting problem to consider:-)