Please include feature. – UPAD for iCloud Review

I wrote earlier, and writing again, this is the best pdf writing apps there. But need some more feature please please include it. * zoom lock feature. If zoomed at a certain level that zoomed level can be locked or unlocked. * scale and compass drawing. Angle measure using Protractor. As I'm math teacher, this feature will be real handy, actually essential. And if this can done pdf like this apps do, ill be ever grateful. WOULD THAT BE TOO DIFFICULT. PLEASE INCLUDE THIS FEATURE, AS AN ADDITIONAL FUNCTIONALITY PURCHASE of this apps, IF U LIKE.
Review by Himuuuu on UPAD for iCloud.