Hi almarderonde, I'm trying to justify some of the measures that were taken in ArcPad 10 and, if you feel that ArcPad 7.1.1 is the better product then, you're entitled to that observation. I know that so much effort was done in making ArcPad 10 a much improved product over previous releases of ArcPad including ArcPad 7.1.1. In the area of drawing, a lot of effort was spent in reducing the memory consumption, improve the responsiveness, implement concurrent progressive drawing and to address bugs such as flickering. But, certaintly, that's not to say that you have data or a project where you find ArcPad 7.1.1 more suitable than ArcPad 10. That's your call, and as a general rule, I'd recommend users be more informed about the product before making a commitment.
As to the QuickDraw tool and its behavior, it is fully configurable. In the Table of Contents, you can control whether skeleton symbology, full skeleton and visibility by modifying the QuickDraw column for every layer. You can control the pixelation / coarseness via Advance Settings > Display Quality. The goal of the QuickDraw tool is to provide an alternative way to draw your data which could consider using in certain circumstances, i.e. on devices with low free memory.