Awesome! That would be a huge improvement, I think, even if you just fixed the military standards for Spain. In fact, since I'm not skilled at this at all, there are only specific banners for certain factions while others had to have generic ones like Swiss or Mercenary ones. For instance, since Portugal played no part in the Italian Wars, I had to give their faction the banners of Florence or something, simply because the colors were a better match than anything else. It would be fantastic to create all new military standards for each faction specifically, although I think the ones for France, Venice, Pisa, and the HRE look fine and do not need to be changed. I think the Swiss one with the cross is fine, but the one with the bear on it (the coat of arms for Bern) is perhaps anachronistic and belongs to the 17th or 18th century, right? I'm not sure.
Since I'm playing on a somewhat crap HP Pavilion Notebook with an "HD Graphics Family" card, I usually play my game with the resolution set at 1366 x 768. The resolution 1920 x 1080 produces problems and sometimes crashes the game because it can't handle it very well. I have some of the graphics kicked up like unit texture quality and detail plus high details for vegetation and "bloom" turned on, but with low detail for shadows and buildings, no reflection effects for water, and low graphics settings for general effects. I also use bilinear filtering and no anti-aliasing. I sometimes use high grass detail, but for huge battles I usually turn grass detail off entirely to avoid the risk of too much system resources being used up and the game crashing because my stupid card can't handle all the graphics and thousands of soldiers all at once.
Stainless Steel admittedly rarely crashes, even with high graphics turned on and with a special...patch shall we say ...that enhances overall performance for any M2TW mod. However, I keep my graphics and resolution in the mid range overall because I also play games like Europa Barbarorum II and Third Age Total War, which would make it crash to the desktop otherwise.