So the very essence of this complaint, according to the OP, is that the Sprint button is a pain because of it's positioning within the action bar. Okay. Apparently to make the most of it Sprint would need to be located within slots 1-5 for ease of use and convenience... Fair enough. I can sort of see where you're coming from.

But at the same time this seems a moot point.

Not only are there more slots than we are previously used to anyway, there are also 3 action bars available onscreen at any given time - if it bothers you, apply Sprint to slots Shift 1-5 or Alt 1-5 - which are no less easier to use with just one hand (although Alt+ is admittedly easier than Ctrl+) and makes your favored 1-5 slots wholly available.

If anything I would actually increase the cooldown on Sprint so as to make its use less repetitive and more strategic, because as people rightly pointed out, if it's pretty much constantly available we may as well just constantly move at that speed without the need for Sprint. Additionally, the TP shouldn't restore whilst Sprint is active - it's pointless that Sprint uses all your TP but a few seconds later, you have 1000 TP back anyway. These changes will make it a more strategic mechanic, such as escaping the wrath of dangerous enemies, rather than a spammy gimmick.