To continue with the direction in which DiapDealer's post has turned me, I was searching the net for info on hot keys and customization possibilities and i found this great little app that allows you to make something like macros to be used in Sigil: AutoHotkey.
Now i have shortcuts for most frequently used HTML tags, like
</p> <p class="xxx">; <i> </i>, etc. and i'm still learning other possibilities.
I hope somebody finds this information useful.
http://www.autohotkey.com/