Power Pivot :: List Separator Not Properly Recognize Semi-colon Instead Of Comma

I am using Excel 2013 64bit and use an english Excel version, but with a comma as a decimal seperator and semi-colon as a list seperator.

In Excel everything works fine, but PowerPivot does not properly recognize that I use a semi-colon for formulas.

PowerPivots lets me write formulas with the semi-colon and not the comma, so that is fine.

However, two issues appear:

the yellow smart formula help box that appears when you start typing a formula, thinks I have to use commas, so when I use semi-colons instead, it does not jump to the next parameter.This problem also causes parameters where I have to enter a table or field to not suggest me table and fields when I start typing.Sometimes the formula validation even throws me an exception, that my formula syntax is incorret, ebcause Id id not use a comma. However, commas also do not work. I have to do some weird playing around until it finally accepts my formula.

I hope this buggy behaviour gets fixed, but is there a way I can work around this without changing my formula/list seperator? I also do not want to use a German Excel version, because I am used to the english formulanames.