> The problem is when it parses the SQL, it searchs for strings preceded by a : and treats them as a parameters, so in the case above it finds :param1 and :var1.
>
> I presume there are other tools with the same problem out there. Is there some recomended workaround/fix?

I'd suggest you to go to Zeos support. It's internal parser is
definitely not a Firebird problem.

SY, SD.