I find problem which was for me realy stressfull. This problem isn't problem in Sencha Cmd but in IE8. I think that solving this problem in Sencha Cmd will be nice for developing for legacy IE8 browser.
Sencha Cmd tool generated CSS file(from SASS+COMPASS rules) for project. I think normaly one file with all CSS rules. IE8 has limitation for amount of CSS rules per file. I think that limit is 4096 CSS rules. If the limit is reached then other rules are ignored. I think will be nice when Sencha Cmd will manage it. I don't know what is the best solution. It may be spliting one file to more files when limit is reached.
I will be glad if some solution exists to this topic now. It may be some solution with the help of Ant or some thing else what Sencha Cmd offers now.