Should be possible in future xojo releases having the autocomplete statement feature?
For example if i write [quote]if something then[/quote], pressing enter the sytem writes automatically [quote]end if[/quote]?
It could be very useful.
Try Shift + Enter today 
You can even write: If … and press Shift+Enter without the “then”
And it does not only work for "if … Then Statements. 
Also refer to these pages in the User Guide:
[quote]Ctrl + Enter (Option-Enter on OS X): Extends code to a new line by automatically adding the _ character.
Ctrl + \ (?-\): Toggles the breakpoint on the line on or off.
Ctrl + ’ (?-’): Comments or uncomments the selected code lines or the line the cursor is on if no code is selected.[/quote]
all that I can use only with a (big) keyboard ?
On a (Linux) Notebook I have no ’ without using SHIFT
Comment works, uncomment not - when selecting nothing,
if code is selected it is replaced by ’