Xamarin.iOS plugin Combo box form control issues

Issue 1) I'm getting some complaints from users that the combobox picker is too narrow compared to the iOS picker which lets you see 4-5 items of the list. The plugin only displays one visible choice at a time in the picker control that shows up at the bottom of the screen when you focus on a combo box (see attachement).
Is there anyway you could please increase the vertical size of the picker control so that up to 5 options are visible at a time?

Issue 2) Also, I noticed that the plugin doesn't allow the option for typing into a combobox that allows manual text entry. This could be the reason why the picker is so short (to display a keyboard and the picker control at the same time). However the keyboard will not pop up in a combo box that allows editable text.
Is the plugin supposed to support manual text entry in a combobox that allows it or am I doing something wrong in the PDF form setup?

I attached the PDF file for ease in testing the combobox manual text entry issue.