Disappointed there's still no answers here. Is there any ongoing support for Blackberry anymore at Sencha?
OS7 is loaded with bugs right now, the icons don't draw, address bar won't move out of the way, can't click form elements, scrolling is all screwy and maps crashes the browser.
Re: Bold screen size, I found creating a special Ext.is for the bold helps you scale sizes down, assuming you've used ems for element sizes rather than pixels or points:
Basically you'll need to treat any app in the Bold kind like a landscape-oriented app in iPhone/Android, except that its not as wide... or as tall.
regex: /blackberry 99/i,
document.body.style.fontSize = '0.725em';