Yes the mIRC's toolbar have always the same size, it's due IMO to the toolbar's icons wich have been made in 16x16 pixels.
I think mIRC doesn't allows to resize toolbar for this reason. A bigger toolbar should have bigger icons than 16x16 (ex: 32x32,48x48, or other).
Make a bigger toolbar with no ico > 16x16 will brings a bad visual effect because of the pixelation.:
Ex: Winrar with 150%, icons are pixelated:
Winrar with 100%, icons are fine:
Creating several resolution for
one icon is a long task, this have been done for the mIRC.exe icon application and switchbar if I'm right. So since there is more than 10 icons in the toolbar, I guess creating 32x32 and 48x48 icon version on each of them will be very long for an non-designer.
Creating .svg icons prevent pixelation when resizing icon in any resolution, but in general is harder to make a vector image (losseless) than a bitmap one.
