[Anak]

I've played around with the firmware to change the dimensions of the bottom bar in reading mode. See the attached file for a visual result.
The first picture shows a screen shot of the originial firmware 2.5.1. bottom bar
The second and fourth picture show the adjusted page number footer in reading mode.
The third picture shows the menu bar of which the dimensions have not changed (the changes have no effect on the menu bar). Compare with the second picture.
The second and third picture show the modified page number footer in reading mode.

Second image

ReadingFooter {
	min-height: 40px;
	max-height: 40px;
	qproperty-footerMargin: 20;
}

Third image

ReadingFooter {
	min-height: 30px;
	max-height: 30px;
	qproperty-footerMargin: 30;
}

Device: Kobo Touch
Firmware: 2.5.1.
File: libnickel.so.1.0.0
Path: \usr\local\Kobo