Yes the hOs.dll can do smooth progress bars. Above is the screenshot that has it as smooth and below is from the hOS help file.
Parameters:
<#panel> [styles]
Description:
This command attach a progressbar on a panel of the statusbar. [styles] is optional. See Events.
<#panel> panel number
[styles] the styles are:
noxptheme - remove the xp theme
vertical - vertical progressbar
smooth - smooth progressbar
marquee - marquee progressbar (work only on Windows XP or better)
track - progressbar as trackbar
handcurs - show the hand cursor on the progressbar (use it with track style)
windowedge
clientedge
staticedge
dlgmodal
dlgframe
border
Example:
//dll hOS.dll AddProgressBar 1 noxptheme
//dll hOS.dll AddProgressBar 2 smooth track
//dll hOS.dll AddProgressBar 3