Sony Vegas Movie Studio Platinum 11.0 refuses to render any video at a fps higher than 30.

Shotcut is a free, open source, cross-platform, non-linear video editor.

There are more video editors out there than I think you realise. Kdenlive is free, has most of the same features as Vegas and isn't overly complex. Shotcut is also free and slightly simpler.

Free and open-source, full-featured video editor.

There are more video editors out there than I think you realise. Kdenlive is free, has most of the same features as Vegas and isn't overly complex. Shotcut is also free and slightly simpler.