I just bought an Alcatel One Touch 995 with Gingerbread 2.3, when I display the notification the notification pane I have some icons I can click to activate GPS, wifi, bluetooth, rotation... I know there are some power control tools but I'd like to know if there is a way to cutomize the icons already displayed in my notification pane?
Not by default. Certain ROMs like CyanogenMod do allow you to customise the toggles and the order in which they're displayed.
A possible workaround could be this app - Notification Toggle
Stock ROMs often don't allow to customize notification toggles. Either you'll have to flash a custom ROM (e.g. CyanogenMod) or install a third-party app (e.g. Widgetsoid).
Not on a stock rom, sorry.
On certain custom/aftermarket ROM's, such as CyanogenMod, have the ability to customize these icons, by letting you add, remove and reorder the icons.